I have a question about Nextel, It may sound confusing and it's not something I can call the company about.

My friend lost his Nextel phone, thought he did anyway. Reported it to Nextel, they sent him another one for mad cheap cause it was "stolen"....2 days later he found it in his car, but the new one was already on the way. He wants to give the old phone to his brother. Nextel deactivated the old SIM card or whatever in his old phone, so he cant use it.

My question is...if his brother puts his SIM card for HIS number into the others old phone that is suppose to be reported as lost....will Nextel know someone is using the phone?? Can they track that?