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have you tried calling from where you know you will be on a seperate tower? because this may just be some sort of tower issue, where your phone is communicating properly. i didnt notice any software that might be causing it, altho sometimes you never know. try calling with or without the sd card, as well as pulling the battery out, and then leaving it out for a few minutes before replacing it and powering it on, and see if that makes a difference. other than that, hard reset, and if that doesn't work, then your phone is busted, and you should probably get it replaced.
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