ARRAY DIGITAL INFRASTRUCTURE, INC.

Note 1 Basis of Presentation

United States Cellular Corporation (UScellular), a Delaware Corporation, is an 83%-owned subsidiary of Telephone and Data Systems, Inc. (TDS).

The accounting policies of UScellular conform to accounting principles generally accepted in the United States of America (GAAP) as set forth in the Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC). Unless otherwise specified, references to accounting provisions and GAAP in these notes refer to the requirements of the FASB ASC. The consolidated financial statements include the accounts of UScellular, subsidiaries in which it has a controlling financial interest, general partnerships in which UScellular has a majority partnership interest and certain entities in which UScellular has a variable interest that requires consolidation into the UScellular financial statements under GAAP. Intercompany accounts and transactions have been eliminated.

UScellular's business segments reflected in this Quarterly Report on Form 10-Q for the period ended March 31, 2025, are Wireless and Towers. All of UScellular's segments operate only in the United States. See Note 10 — Business Segment Information for summary financial information on each business segment.

Certain numbers included herein are rounded to millions for ease of presentation; however, certain calculated amounts and percentages are determined using the unrounded numbers. These unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and the notes thereto included in UScellular’s Annual Report on Form 10-K (Form 10-K) for the year ended December 31, 2024.

The accompanying unaudited consolidated financial statements contain all adjustments (consisting of normal recurring items, unless otherwise disclosed) necessary for the fair statement of UScellular’s financial position as of March 31, 2025 and December 31, 2024, its results of operations, cash flows and changes in equity for the three months ended March 31, 2025 and 2024. The Consolidated Statement of Comprehensive Income was not included because comprehensive income for the three months ended March 31, 2025 and 2024, equaled net income. These results are not necessarily indicative of the results to be expected for the full year. UScellular has not changed its significant accounting and reporting policies from those disclosed in its Form 10-K for the year ended December 31, 2024.

Restricted Cash

UScellular presents restricted cash with cash and cash equivalents in the Consolidated Statement of Cash Flows. Restricted cash primarily consists of balances required under the receivables securitization agreement. The following table provides a reconciliation of Cash and cash equivalents and restricted cash reported in the Consolidated Balance Sheet to the total of the amounts in the Consolidated Statement of Cash Flows.

Note 2 Revenue Recognition

Disaggregation of Revenue

In the following table, UScellular's revenues are disaggregated by type of service, which represents the relevant categorization of revenues for UScellular, and timing of recognition. Service revenues are recognized over time and Equipment sales are recognized at a point in time.

1 Total revenues from contracts with customers represents revenues related to the Wireless segment and Operating lease income represents revenues related to the Towers segment.

Contract Balances

The following table provides balances for contract assets from contracts with customers, which are recorded in Other current assets and Other assets and deferred charges in the Consolidated Balance Sheet, and contract liabilities from contracts with customers, which are recorded in Customer deposits and deferred revenues and Other deferred liabilities and credits in the Consolidated Balance Sheet.

Revenue recognized related to contract liabilities existing at January 1, 2025 was $118 million for the three months ended March 31, 2025.

Transaction price allocated to the remaining performance obligations

The following table includes estimated service revenues expected to be recognized related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period. These estimates represent service revenues to be recognized when wireless services are delivered to customers pursuant to service plan contracts and under certain roaming agreements with other carriers. These estimates are based on contracts in place as of March 31, 2025 and may vary from actual results. As practical expedients, revenue related to contracts of less than one year, generally month-to-month contracts, and contracts with a fixed per-unit price and variable quantity, are excluded from these estimates.

Contract Cost Assets

UScellular expects that commission fees paid as a result of obtaining contracts are recoverable, and therefore UScellular defers and amortizes these costs. As a practical expedient, costs with an amortization period of one year or less are expensed as incurred. The contract cost asset balance related to commission fees and other costs was $129 million and $132 million at March 31, 2025 and December 31, 2024, respectively, and was recorded in Other assets and deferred charges in the Consolidated Balance Sheet. Deferred commission fees are amortized based on the timing of transfer of the goods or services to which the assets relate, typically the contract term. Amortization of contract cost assets was $23 million and $22 million for the three months ended March 31, 2025 and 2024, respectively, and was included in Selling, general and administrative expenses.

Note 3 Fair Value Measurements

As of March 31, 2025 and December 31, 2024, UScellular did not have any material financial or nonfinancial assets or liabilities that were required to be recorded at fair value in its Consolidated Balance Sheet in accordance with GAAP.

The provisions of GAAP establish a fair value hierarchy that contains three levels for inputs used in fair value measurements. Level 1 inputs include quoted market prices for identical assets or liabilities in active markets. Level 2 inputs include quoted market prices for similar assets and liabilities in active markets or quoted market prices for identical assets and liabilities in inactive markets. Level 3 inputs are unobservable. A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. A financial instrument’s level within the fair value hierarchy is not representative of its expected performance or its overall risk profile and, therefore Level 3 assets are not necessarily higher risk than Level 2 assets or Level 1 assets.

As of March 31, 2025, UScellular recorded a net written call option at fair value, which was considered Level 3 within the fair value hierarchy. See Note 6 — Divestitures for additional information.

UScellular has applied the provisions of fair value accounting for purposes of computing the fair value of financial instruments for disclosure purposes as displayed below.

Long-term debt excludes lease obligations, the current portion of Long-term debt and debt financing costs. The fair value of Long-term debt was estimated using various methods, including quoted market prices and discounted cash flow analyses.

The fair values of Cash and cash equivalents, restricted cash and short-term debt approximate their book values due to the short-term nature of these financial instruments.

Note 4 Equipment Installment Plans

UScellular sells devices to customers under equipment installment plans over a specified time period. For certain equipment installment plans, after a specified period of time or amount of payments, the customer may have the right to upgrade to a new device and have the remaining unpaid equipment installment contract balance waived, subject to certain conditions, including trading in the original device in good working condition and signing a new equipment installment contract.

The following table summarizes equipment installment plan receivables.

UScellular uses various inputs to evaluate the credit profiles of its customers, including internal data, information from credit bureaus and other sources. From this evaluation, a credit class is assigned to the customer that determines the number of eligible lines, the amount of credit available, and the down payment requirement, if any. These credit classes are grouped into four credit categories: lowest risk, lower risk, slight risk and higher risk. A customer's assigned credit class is reviewed periodically and a change is made, if appropriate. An equipment installment plan billed amount is considered past due if not paid within 30 days. The balance and aging of the equipment installment plan receivables on a gross basis by credit category were as follows:

The balance of the equipment installment plan receivables as of March 31, 2025 on a gross basis by year of origination were as follows:

The write-offs, net of recoveries for the three months ended March 31, 2025 on a gross basis by year of origination were as follows:

Activity for the three months ended March 31, 2025 and 2024, in the allowance for credit losses for equipment installment plan receivables was as follows:

Note 5 Earnings Per Share

Basic earnings per share attributable to UScellular shareholders is computed by dividing Net income attributable to UScellular shareholders by the weighted average number of Common Shares outstanding during the period. Diluted earnings per share attributable to UScellular shareholders is computed by dividing Net income attributable to UScellular shareholders by the weighted average number of Common Shares outstanding during the period adjusted to include the effects of potentially dilutive securities. Potentially dilutive securities primarily include incremental shares issuable upon the exercise of outstanding stock options and the vesting of performance and restricted stock units, as calculated using the treasury stock method.

The amounts used in computing basic and diluted earnings per share attributable to UScellular shareholders were as follows:

Certain Common Shares issuable upon the exercise of stock options or vesting of performance and restricted stock units were not included in weighted average diluted shares outstanding for the calculation of Diluted earnings per share attributable to UScellular shareholders because their effects were antidilutive. The number of such Common Shares excluded was less than 1 million for both the three months ended March 31, 2025 and 2024.

Note 6 Divestitures

On August 4, 2023, TDS and UScellular announced that the Boards of Directors of both companies decided to initiate a process to explore a range of strategic alternatives for UScellular. On May 28, 2024, UScellular announced that its Board of Directors unanimously approved the execution of a Securities Purchase Agreement (Securities Purchase Agreement) by and among TDS, UScellular, T-Mobile US, Inc. (T-Mobile) and USCC Wireless Holdings, LLC, pursuant to which, among other things, UScellular has agreed to sell its wireless operations and select spectrum assets to T-Mobile for a purchase price, subject to adjustments as specified in the Securities Purchase Agreement, of $4,400 million, which is payable in a combination of cash and the assumption of up to approximately $2,000 million in debt. The purchase price includes $100 million contingent on the satisfaction of certain financial and operational targets prior to close; based on projected performance against such targets through an expected mid-year 2025 close, UScellular does not expect to receive most of this contingent consideration. The purchase price also includes $400 million allocated to certain wireless spectrum licenses held by entities in which UScellular is a non-controlling limited partner. The closing with respect to these wireless spectrum licenses is contingent upon UScellular's purchase, which is pending receipt of regulatory approval, of the remaining equity in the entities that UScellular does not currently own. The Securities Purchase Agreement also contemplates, among other things, a Short-Term Spectrum Manager Lease Agreement and Short-Term Spectrum Manager Sublease Agreements that will become effective at the closing date, which provide T-Mobile with an exclusive license to use certain UScellular spectrum assets and leases at no cost for up to one-year for the sole purpose of providing continued, uninterrupted service to customers. UScellular expects to present the wireless operations and select spectrum assets sold to T-Mobile as discontinued operations if and when the accounting criteria is met. The sale of the wireless operations to T-Mobile is expected to close in mid-2025, subject to the receipt of regulatory approvals and the satisfaction of customary closing conditions.

On October 17, 2024, UScellular, and certain subsidiaries of UScellular, entered into a License Purchase Agreement (Verizon Purchase Agreement) with Verizon Communications Inc. (Verizon) to sell certain AWS, Cellular and PCS wireless spectrum licenses and agreed to grant Verizon certain rights to lease such licenses prior to the transaction close for total proceeds of $1,000 million. As of March 31, 2025, the book value of the wireless spectrum licenses to be sold was $586 million. The transaction is subject to regulatory approval and other customary closing conditions, and is contingent on the closing of the T-Mobile transaction and the termination of the T-Mobile Short-Term Spectrum Manager Lease Agreement.

On November 6, 2024, UScellular, and certain subsidiaries of UScellular, entered into a License Purchase Agreement (AT&T Purchase Agreement) with New Cingular Wireless PCS, LLC (AT&T), a subsidiary of AT&T Inc. to sell certain 3.45 GHz and 700 MHz wireless spectrum licenses and agreed to grant AT&T certain rights to lease and sub-lease such licenses prior to the transaction close for total proceeds of $1,018 million, subject to certain purchase price adjustments. As of March 31, 2025, the book value of the wireless spectrum licenses to be sold was $859 million. The transaction is subject to regulatory approval and other customary closing conditions and substantially all of the licenses subject to the transaction are contingent on the closing of the T-Mobile transaction. The purchase price includes $232 million allocated to certain wireless spectrum licenses that are held by an entity in which UScellular is a non-controlling limited partner. The closing with respect to these wireless spectrum licenses is contingent upon UScellular's purchase, which is pending receipt of regulatory approval, of the remaining equity in the entity that UScellular does not currently own.

The strategic alternatives review process is ongoing as UScellular works toward closing the transactions signed during 2024, including the T-Mobile, Verizon and AT&T transactions and continues to seek to opportunistically monetize its spectrum assets that are not subject to the Securities Purchase Agreement, the Verizon Purchase Agreement or the AT&T Purchase Agreement.

UScellular incurred third-party expenses related to the announced transactions and strategic alternatives review of $10 million and$7 millionfor the three months ended March 31, 2025 and 2024, respectively, which are included in Selling, general and administrative expenses.

As part of the transaction, UScellular entered into a Put/Call Agreement with T-Mobile whereby T-Mobile has the right to call certain spectrum assets and UScellular has the right to put certain spectrum assets to T-Mobile for an aggregate agreed upon price of $106 million. The call option notice period started on May 24, 2024, and the put exercise period starts at the close of the broader transaction. There was no cash exchanged at the inception of the Put/Call Agreement. All license transfers pursuant to any put/call are subject to Federal Communications Commission (FCC) approval. UScellular accounts for this instrument as a net written call option and records such option at fair value each reporting period unless/until such option is exercised or terminated. UScellular estimated the fair value of the net written call option at $4 million as of March 31, 2025, which was recorded to Other current liabilities in the Consolidated Balance Sheet. The change in fair value is recorded to (Gain) loss on license sales and exchanges, net in the Consolidated Statement of Operations.

Note 7 Investments in Unconsolidated Entities

Investments in unconsolidated entities consist of amounts invested in entities in which UScellular holds a noncontrolling interest. UScellular’s Investments in unconsolidated entities are accounted for using the equity method, measurement alternative method or net asset value practical expedient method as shown in the table below. The carrying value of measurement alternative method investments represents cost minus any impairments plus or minus any observable price changes.

The following table, which is based on unaudited information provided in part by third parties, summarizes the combined results of operations of UScellular’s equity method investments.

Note 8 Debt

Revolving Credit Agreement

UScellular has an unsecured revolving credit agreement with a maximum borrowing capacity of $300 million. Amounts under the agreement may be borrowed, repaid and reborrowed from time to time until maturity in July 2026. As of March 31, 2025, there wereno outstanding borrowings under the agreement, and UScellular's unused borrowing capacity was $300 million.

In April 2025, UScellular amended the revolving credit agreement to extend the maturity date to July 2027 and allow for permitted dispositions, as specified in the amendment. The amendment also includes a provision that will be triggered upon the sale of the UScellular wireless operations to T-Mobile, which accelerates the maturity date to the earliest of (i) 270 days following the consummation of the sale of the UScellular wireless operations to T-Mobile, (ii) the date on which UScellular receives net proceeds from the cumulative sale of wireless spectrum licenses to AT&T, Verizon and other parties that equals or exceeds $1.1 billion, or (iii) July 20, 2027. Additionally, the amendment to the UScellular revolving credit agreement includes a provision that will be triggered upon UScellular receiving net proceeds from the cumulative sale of wireless spectrum licenses to AT&T, Verizon and other parties that equals or exceeds $500 million, which provision would automatically reduce the maximum borrowing capacity of the revolving credit agreement from $300 million to $150 million five business days after UScellular's receipt of such net proceeds.

Term Loan Agreements

UScellular has unsecured term loan agreements with maximum borrowing capacities of $800 million. The maturity dates for the agreements range from July 2026 to July 2031. As of March 31, 2025, UScellular has borrowed the full amount available under the agreements and the outstanding borrowings were $718 million.

In April 2025, UScellular amended the $300 million term loan agreement due July 2026 to extend the maturity date to July 2027 and allow for permitted dispositions, as specified in the amendment.

Debt Covenants

The revolving credit agreement, term loan agreements, export credit financing agreement and receivables securitization agreement require UScellular to comply with certain affirmative and negative covenants, which include certain financial covenants that may restrict the borrowing capacity available. UScellular is required to maintain the Consolidated Leverage Ratio, based on gross debt, as of the end of any fiscal quarter at a level not to exceed the following:4.00 to 1.00 from April 1, 2024 through and including March 31, 2025;3.75 to 1.00 from April 1, 2025 and thereafter. UScellular is also required to maintain the Consolidated Interest Coverage Ratio at a level not lower than 3.00 to 1.00 as of the end of any fiscal quarter. UScellular believes that it was in compliance as of March 31, 2025 with all such financial covenants.

In April 2025, the revolving credit agreement and the $300 million term loan agreement were amended to require, upon the consummation of the sale of the UScellular wireless operations to T-Mobile, UScellular to maintain the Consolidated Leverage Ratio, based on net debt, as of the end of any fiscal quarter from and including the quarter in which such sale occurs at a level not to exceed 3.50 to 1.00.

Note 9 Variable Interest Entities

Consolidated VIEs

UScellular consolidates VIEs in which it has a controlling financial interest as defined by GAAP and is therefore deemed the primary beneficiary. UScellular reviews the criteria for a controlling financial interest at the time it enters into agreements and subsequently when events warranting reconsideration occur. These VIEs have risks similar to those described in the “Risk Factors” in this Form 10-Q and UScellular’s Form 10-K for the year ended December 31, 2024.

UScellular formed USCC EIP LLC (Seller/Sub-Servicer), USCC Receivables Funding LLC (Transferor) and the USCC Master Note Trust (Trust), collectively the special purpose entities (SPEs), to facilitate a securitized borrowing using its equipment installment plan receivables. Under a Receivables Sale Agreement, UScellular wholly-owned, majority-owned and unconsolidated entities, collectively referred to as “affiliated entities”, transfer device equipment installment plan contracts to the Seller/Sub-Servicer. The Seller/Sub-Servicer aggregates device equipment installment plan contracts, and performs servicing, collection and all other administrative activities related to accounting for the equipment installment plan contracts. The Seller/Sub-Servicer sells the eligible equipment installment plan receivables to the Transferor, a bankruptcy remote entity, which subsequently sells the receivables to the Trust. The Trust, which is bankruptcy remote and isolated from the creditors of UScellular, will be responsible for issuing asset-backed variable funding notes (Notes), which are collateralized by the equipment installment plan receivables owned by the Trust. Given that UScellular has the power to direct the activities of these SPEs, and that these SPEs lack sufficient equity to finance their activities, UScellular is deemed to have a controlling financial interest in the SPEs, and therefore consolidates them. All transactions with third parties (e.g., issuance of the asset-backed variable funding notes) will be accounted for as a secured borrowing due to the pledging of equipment installment plan contracts as collateral, significant continuing involvement in the transferred assets, subordinated interests of the cash flows, and continued evidence of control of the receivables.

The following VIEs were formed to participate in FCC auctions of wireless spectrum licenses and to fund, establish, and provide wireless service with respect to any FCC wireless spectrum licenses won in the auctions:

▪Advantage Spectrum, L.P. (Advantage Spectrum) and Sunshine Spectrum, Inc., the general partner of Advantage Spectrum; and

▪King Street Wireless, L.P. (King Street Wireless) and King Street Wireless, Inc., the general partner of King Street Wireless.

These particular VIEs are collectively referred to as designated entities. The power to direct the activities that most significantly impact the economic performance of these VIEs is shared. Specifically, the general partner of these VIEs has the exclusive right to manage, operate and control the limited partnerships and make all decisions to carry on the business of the partnerships. The general partner of each partnership needs the consent of the limited partner, an indirect UScellular subsidiary, to sell or lease certain wireless spectrum licenses, to make certain large expenditures, admit other partners or liquidate the limited partnerships. Although the power to direct the activities of these VIEs is shared, UScellular has the most significant level of exposure to the variability associated with the economic performance of the VIEs, indicating that UScellular is the primary beneficiary of the VIEs. Therefore, in accordance with GAAP, these VIEs are consolidated into the UScellular financial statements.

UScellular also consolidates other VIEs that are limited partnerships that provide wireless service. A limited partnership is a variable interest entity unless the limited partners hold substantive participating rights or kick-out rights over the general partner. For certain limited partnerships, UScellular is the general partner and manages the operations. In these partnerships, the limited partners do not have substantive kick-out or participating rights and, further, such limited partners do not have the authority to remove the general partner. Therefore, these limited partnerships also are recognized as VIEs and are consolidated into the UScellular financial statements under the variable interest model.

The following table presents the classification and balances of the consolidated VIEs’ assets and liabilities in UScellular’s Consolidated Balance Sheet.

1 Total liabilities does not include amounts borrowed under the receivables securitization agreement.

Unconsolidated VIEs

UScellular manages the operations of and holds a variable interest in certain other limited partnerships, but is not the primary beneficiary of these entities, and therefore does not consolidate them into the UScellular financial statements under the variable interest model.

UScellular’s total investment in these unconsolidated entities was $5 million at both March 31, 2025 and December 31, 2024, and is included in Investments in unconsolidated entities in UScellular’s Consolidated Balance Sheet. The maximum exposure from unconsolidated VIEs is limited to the investment held by UScellular in those entities.

Other Related Matters

UScellular made contributions, loans or advances to its VIEs totaling $36 million and $207 million during the three months ended March 31, 2025 and 2024, respectively, of which $31 million in 2025 and $187 million in 2024, are related to USCC EIP LLC as discussed above. UScellular may agree to make additional capital contributions and/or advances to these or other VIEs and/or to their general partners to provide additional funding for their operations or the development of wireless spectrum licenses granted in various auctions. UScellular may finance such amounts with a combination of cash on hand, borrowings under its revolving credit or receivables securitization agreements and/or other long-term debt. There is no assurance that UScellular will be able to obtain additional financing on commercially reasonable terms or at all to provide such financial support.

Note 10 Business Segment Information

UScellular has the following reportable segments: Wireless and Towers. Wireless generates its revenues by providing wireless services and equipment. Towers generates its revenues by leasing tower space on UScellular-owned towers to other wireless carriers. The Towers segment records rental revenue and the Wireless segment records a related expense when the Wireless segment uses company-owned towers to locate its network equipment, using estimated market pricing - this revenue and expense is eliminated in consolidation.

Adjusted earnings before interest, taxes, depreciation, amortization and accretion (Adjusted EBITDA) is the segment measure of profit or loss reported to the chief operating decision maker for purposes of assessing the segments' performance and making capital allocation decisions. Adjusted EBITDA is a non-GAAP financial measure that shows adjusted earnings before interest, taxes, depreciation, amortization and accretion, gains and losses, and expenses related to the strategic alternatives review of UScellular. UScellular believes Adjusted EBITDA is a useful measure of UScellular's operating results before significant recurring non-cash charges, gains and losses, and other items as presented below as it provides additional relevant and useful information to investors and other users of UScellular's financial data in evaluating the effectiveness of its operations and underlying business trends in a manner that is consistent with management's evaluation of business performance. UScellular's chief operating decision maker is the UScellular Chair.

Financial data for UScellular's reportable segments for thethree months ended March 31, 2025 and 2024, is as follows.

1 The significant segment expense categories and amounts align with the segment-level information that is regularly provided to the chief operating decision maker. Intersegment expenses are included within the amounts shown.

2 This item is not included in the evaluation of operating performance of the Wireless and Towers segments, and therefore is reported for "UScellular".

3 Assets are not provided at the individual segment level for Wireless and Towers, and therefore are reported for "UScellular". The UScellular segments operate under a common capital structure, and management has historically considered its assets collectively as part of a combined wireless network.