Company: SONM
Filing Date: 2025-07-14
Form Type: DEFA14A
Source: 0001641172-25-019500
Chunk: 0

Company: SONIM TECHNOLOGIES INC
Filing Date: 2025-07-14
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'>Institutional Shareholders Services (ISS) Recommends Shareholders Support Sonim Management Nominees; Establishes Orbic’s Offer as Incomplete and Ambiguous

VOTE THE WHITEPROXY CARD FOR SONIM TODAY</div>

Dear Sonim Stockholders,

Institutional Shareholder Services (ISS), an independent and leading proxy advisory firm, recommends Sonim stockholders vote FOR Sonim management nominees in the WHITE proxy card, citing appropriate board actions and concerns over Orbic’s “unreasonable demands and incomplete offers.”

To learn more about the ISS report, visit: https://ir.sonimtech.com/news-events/press-releases/detail/268/iss-recommends-sonim-technologies-stockholders-to-vote

Orbic’s Fake Proposals: All Hype, No Substance

| ● | Orbic                                                                                     
 has shown no proof of funds, after months of requests.                                    |
| ● | Orbic’s                                                                                   
 so-called “Commitment Letter” is in fact simply a letter from a placement                 
 agent that agreed to help them source funds.                                              |
| ● |