Company: SONM
Filing Date: 2025-06-18
Form Type: DEFA14A
Source: 0001641172-25-015641
Chunk: 0

Company: SONIM TECHNOLOGIES INC
Filing Date: 2025-06-18
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 |

<div align='center'>Sonim Technologies Provides Update
on Strategic Alternatives Initiatives

Urges Stockholders to Support Sonim’s Qualified Director Nominees
at the Annual Meeting on July 18, 2025

Vote for each of Sonim Board Nominees on the WHITEProxy Card</div>

San Diego, California – June 18, 2025 –Sonim Technologies, Inc. (NASDAQ: SONM), a leading provider of rugged mobile solutions, today outlined its ongoing successful strategic alternatives process and illusory proposals by Orbic North America, LLC (“Orbic”).

In January 2025, following the unsolicited approach from Orbic to acquire Sonim, the Sonim Board formed a Special Committee to explore and evaluate a range of strategic alternatives to maximize stockholder value. Both strategically and tactically, the Special Committee has already found a potentially better alternative for Sonim stockholders to a transaction with Orbic. The Company provided further details in a letter to stockholders, highlights include:

| ● | Sale                                                                                                                                        
 of Assets to Social Mobile: As announced on June 2,