X0206 3 2019-05-09 0 0001178697 SONIM TECHNOLOGIES INC SONM 0001296812 Howe Alan B 1875 SOUTH GRANT STREET, SUITE 750 SAN MATEO CA 94402 1 0 0 0 Stock Option (right to buy) 0.90 2028-09-09 Common Stock 2333 D Twenty-five percent of the shares subject to the option vests on the first anniversary of the vesting commencement date, and the remainder vests in 36 equal monthly installments thereafter for the following three years. /s/ Taruna Punj, Attorney-in-Fact for Alan Howe 2019-05-09