Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statements on Form S-3 (No. 333-239664 and No. 333-254440) and Form S-8 (No. 333-231457, No. 333-239033, No. 333-264161, and No. 333-268320) of Sonim Technologies, Inc. (the “Company”), of our report dated March 20, 2023, relating to the consolidated financial statements of the Company (which report expresses an unqualified opinion and includes an explanatory paragraph relating to a going concern uncertainty), appearing in this Annual Report on Form 10-K for the year ended December 31, 2022.