"No service" when switching SIM card to i275

My brother had an i305 which no longer works, and recently he got a used i275 from a friend who had just gotten a different phone. When he puts his SIM card from the i305 (it's the original card which came with the phone) in the i275 he can access his phone book and everything else, but service has been problematic. He can usually make a call as soon as he puts in the card but as soon as he hangs up there is no service. Today service came back again after he left the phone for a while, but then as soon as he makes another call it's completely gone again.

Any ideas what the problem could be and how he could fix it?

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Originally Posted by TraceyBelle

My brother had an i305 which no longer works, and recently he got a used i275 from a friend who had just gotten a different phone. When he puts his SIM card from the i305 (it's the original card which came with the phone) in the i275 he can access his phone book and everything else, but service has been problematic. He can usually make a call as soon as he puts in the card but as soon as he hangs up there is no service. Today service came back again after he left the phone for a while, but then as soon as he makes another call it's completely gone again.

Any ideas what the problem could be and how he could fix it?

Transfer the info using the Motorola iDEN support tools in my iden links sticky;
Then use the origional SIM card in the phine.