I have Sprint. But I cannot believe the carrier would make a difference. It works just like a Bluetooth headset. I would think the phone and how compatible it is to Bluetooth would make the difference. The really cool thing is it automatically connects when you get close to the truck and the key is on. You don?t have to tell it to connect or anything. I have the nav system with touch screen. I could have installed it without the coastal e tech adapter but I was trying not to splice any wires. Although all my wiring I had to reference a Cadillac radio because parrot had nothing for Hummer. I would try to go here
http://www.parrot.com/usa/support/in...s/parrotmk6100 and find a radio that matches your GM radio and you should be able to wire it without an adapter. It?s just not plug_and_play that way. The main wire is finding out which is the mute wire. The others are just power, ground and speaker wires. Hope this helps!
