Company: SONM
Filing Date: 2025-06-20
Form Type: DEFA14A
Source: 0001641172-25-015847
Chunk: 0

Company: SONIM TECHNOLOGIES INC
Filing Date: 2025-06-20
Form: DEFA14A
Chunk 0
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934</div>

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

| ☐ | Preliminary                                                       
 Proxy Statement                                                   |
| ☐ | Confidential,                                                     
 for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| ☐ | Definitive                                                        
 Proxy Statement                                                   |
| ☒ | Definitive                                                        
 Additional Materials                                              |
| ☐ | Soliciting                                                        
 Material under §240.14a-12                                        |

<div align='center'>Sonim Technologies, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)</div>

Payment of Filing Fee (Check all boxes that apply):

| ☒ | No                                                                                              
 fee required                                                                                    |
| ☐ | Fee                                                                                             
 paid previously with preliminary materials                                                      |
| ☐ | Fee                                                                                             
 computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 |

Subject: Sonim July 18 Annual Meeting

Team,

Earlier this week, our Board of Directors shared an update with all of our stockholders on our ongoing review of strategic alternatives and the efforts by Orbic North America, LLC to try to take control of our Company. You can read more in the press release we issued here.

The Sonim Annual Meeting is July 18, 2025, and as fellow stockholders, your vote is important.

The Sonim Board strongly recommends all stockholders to vote FOReach of the Company’s highly qualified director nominees using the WHITEproxy card, as soon as possible. If you have any questions on how to vote, please contact the Company’s proxy solicitor, contact details below.

Thank you for your continued support and dedication to Sonim!

Peter

Peter Liu

CEO

Sonim Technologies

<div align='center'>For more information or assistance with voting your shares, please call the Company’s proxy solicitor:

Toll Free: (800) 662-5200
E-mail: SONM@investor.sodali.com</div>

Important Information and Where to Find