SONIM TECHNOLOGIES INC

FOR THE 2025 SPECIAL MEETING OF STOCKHOLDERS

To be held on Thursday, October 16, 2025

This proxy statement contains information about the 2025 Special Meeting of Stockholders (the “Special Meeting”) of Sonim Technologies, Inc. (“Sonim,” the “Company,” or “we”), which will be held on Thursday, October 16, 2025, at 9:00 a.m., Pacific Time. The Special Meeting will be held virtually via live audio webcast. You will be able to virtually attend the Special Meeting as well as vote and submit your questions during the live audio webcast of the meeting by visiting www.proxydocs.com/SONM and entering the control number included on your proxy card or in the instructions that accompanied your proxy materials.

All properly submitted proxies will be voted in accordance with the instructions contained in those proxies. If no instructions are specified, the proxies will be voted in accordance with the recommendation of our board of directors ( the “board” or “our board,” whether capitalized or not) with respect to each of the matters set forth in the accompanying notice of meeting. You may revoke your proxy at any time before it is exercised at the meeting by one of the methods described under the title “May I change or revoke my proxy?”

This proxy statement and the form of proxy were first sent or given to stockholders on or about September 19, 2025.

The mailing address of our principal executive offices is Sonim Technologies, Inc., 4445 Eastgate Mall, Suite 200, San Diego, California 92121.