Okay, so all of a sudden this past Friday my son's Alltel phone won't allow him to make or receive calls. He gets a recording that says "Sprint voice yada, yada... account not registered on this network." This has been going on for a day and a half now. He has lived in Austin, TX for 3 years and never had this problem before. Of course, Alltel offices are closed for the weekend. I know that Alltel is currently undergoing serious changes to their system, because on Friday I bought a new phone through Alltel and they weren't immediately able to activate it. In fact, they said that it may be Monday 'til it's activated due to system changes that they're undergoing. My understanding is that they're changing billing systems, so this shouldn't affect my son's phone. We currently have 3 phones on our account, plus the one that won't be activated 'til Monday, and my son's phone is the only one having the problem. He lives in Austin and the rest of us are about an hour plus away. Does anyone have any ideas as to what may be causing this?? Thanks!