... then press Menu key2. Press # key to number. (123 On the LCD, meaning number)3. Press 1key 1 time, 1 is ok ... if wrong input, press Del key to delete the last number(3) GPRS Port:1. In the sub-menu, press Up ... press Menu key2. Press # key to number. (123 On the LCD, meaning number)3. Press 2key 1 time, 2 is ok ... ;Then, press 3key 1time, 3 is ok;Then, ...