I just finished a one hour call in which I had no problems with my phone. I tried to make another call and the phone was silent - no dial sound, no sound when the other person picked up. I tried calling another phone in the house, with the same result, silence. One one of my attempts to call the other phone in the house I got a bunch of crackling on the line and could hear someone saying "hi". I tried taking out the battery and SIM card and now I just get garbled crackling. What's up??