No its not, but AT&T is the one with the most complaints for this issue.
Its a known AT&T 3g network problem, because it doesn't happen at all/as often (depending on area) when the phone is put into 2G mode.
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~Midnight Draven
"That's it then. Cancel the kitchen scraps for lepers and orphans, no more merciful beheadings... and call off Christmas."
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