Question about Motorola Mobility MOTOKRZR K1 Cellular Phone

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V365 unregistered SIM message

On my two Moto V365's, lately evyr few days they stop working and disply "unregistered SIM". I shut it off, remove battery and SIM, and re-install - problem went away on my wife's for at least a few weeks now but mine reocurrs every few days.
THese are legit fones, on Cingular/AT&T.

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