Report "Error message My pantech duo gives me the message"cannot complete the call. The signal may be unavailable or the phone number may not be valid. Verify the number or try again." Every time I try to make a call. The phone is charged, shows that I have a signal, and accepts incoming calls only into voicemail. The phone never rings. My son had been playing with the phone prior to the problem starting. I have gone through all the menus and cannot determine the solution. Any suggestions"