GSM to Phone Adapter Device with USA Dial Tone 3G USA Dial Tone, 3G Compatible, Support Auto Dialing and Answering Compatible to most telephones, PBX and VoIP gateways (for call Termination) Support SIM card (1.8V,3V) , Support DTMF 2'nd dialing out, DTMF CLIP(Caller ID display) Hide subscriber caller id (been sent out), Locking PIN / network (optional) GPRS function(optional)