I just got a Iphone 3g 16gb and Im using the Turbo Sim with Tmobile Sim card the first one didnt work the 2nd one works but it loses signal all the time sometimes people call me and it gives them messages that phone is not in service and I never get the phone calls. I have to always reset the phone for it work is there anything out there that is better then what I have I dont know if I can put up with all the loss signals