I have a fairly new Mophie Juice Pack and have recently had problems with my phone calling. If I enter the number (direct dial or from contacts) the phone goes into action but never actually connects to the network. Similarly, when the phone is in this state, I can call it, but it won't ring. I can fix the situation by rebooting. I have a feeling that this problem is somehow caused by the Mophie. I'm wondering if anyone else is experiencing similar problems.