My phone wont let me call anyone or receive calls. however i can still text and receive texts. when i try calling someone it tries to and then says their is no signal. only two calls have gone through in the past 24 hours and they only lasted a couple seconds then were dropped. i have never had this problem before.its not my phone. i tried switching phones and it did the same thing. I tried turning the phone on and off. anyone have a suggestion?