Company: SONM
Filing Date: 2025-11-12
Form Type: 424B3
Source: 0001493152-25-021905
Chunk: 54

Company: SONIM TECHNOLOGIES INC
Filing Date: 2025-11-12
Form: 424B3
Chunk 54
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 is, or is deemed to be, incorporated by reference into this prospectus modifies or supersedes that statement. Any statement so modified or superseded will not be deemed, except as so modified or superseded, to constitute a part of this prospectus.

You may obtain any of the documents incorporated by reference in this prospectus from the SEC through the SEC’s website at the address provided above. You may also request and we will provide, free of charge, a copy of any document incorporated by reference in this prospectus (excluding exhibits to such document unless an exhibit is specifically incorporated by reference in the document) by visiting our internet website at https://ir.sonimtech.com or by writing or calling us at the following address and telephone number:

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

4445 Eastgate Mall, Suite 200

San Diego, CA 92121

Telephone: (650) 378-8100

Attn.: Chief Financial Officer</div>

In accordance with Rule 412 of the Securities Act, any statement contained in a document incorporated by reference herein shall be deemed modified or superseded to the extent that a statement contained herein or in any other subsequently filed document which also is or is deemed to be incorporated by reference herein modifies or supersedes such statement.

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<div align='center'>19,444,444Shares of Common Stock

Sonim Technologies, Inc.

PROSPECTUS

November 12,2025</div>