I can't Receive SMS/Call when using my Cellular Data network ( GPRS ) on my iPhone 4S .. What should i do ?
When i'm Using Cellular data network , there is no network activity on my phone , and i cant receive SMS or Call , after i turn off the cellular network , my network activity comes back , and my sms begin to be received , and i can receive calls too ,, how i can solve this problem ?!
iPhone 4S, iOS 6.1.2