I had this same problem and spoke with sprint about how to fix it. They had no answers, I do not believe it is an issue with the handset, I do believe it is an issue with the sprint network. It happened for about 5 days. On the second I ordered a replacement, on the sixth I recieved the replacement and magically the phone began working again. By then it was too late. I'd say give it a week if you can and contact sprint to have you bill reduced for the month. I had them credit me equivalent to a weeks worth of usage for this issue.
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