GSM Desk Telephone Sourcingbay M281 2G SMS Function Caller ID/Call Waiting Rechargeable Battery Included(Black) Full sized desktop style phone that makes and receives calls,sends and receives message,etc. Easy & Simple to Use with LCD display:2.4 inches screen. You can download the user manual on this item page. 2G GSM SIM card(not included) is required for using this home desk telephone. You may find one from following SIM card carrier: SpeedTalk Mobile GSM Compatibility: GSM 850Mhz/900/MHz/1800MHz/1900Mhz. But please note: It is NOT a land line phone. With Rechargeable Battery and GSM Function, you can to move around easily when you use it.