So last night I was expecting a call some time early in the morning to go into work. I had my droid charging in the dock. I wake up at 7 never getting the call. I look at the phone and it has no service. I always have full service at my house. The phone had a message something like "phone not registered with network". I powered down phone and turned back on. Bam, full service, 2 voice messages and about 10 missed texts. What the heck??? I can't have this happening, I was an hour late. What could have caused this problem and how can I keep it from happening again?