pre-paid questions

Hi. I have a couple of questions that I couldn't find answers to..

1) I just bought a tmobile sim card that was activated in California. It has a Californian area code, so I wanted to know if it was possible to change the area code/phone number to a Texas one. The seller had told me that there was a six month period where if I changed the area code my sim card would be deactivated and that I would have to buy a new one.. is this true?

2) Does t-mobile offer rollover? If I don't use up all my minutes and then add a refill before the expiration do my unused minutes add on to the new refill?

3) Last question. If I don't add refills to my card how long would it be before my phone is deactivated. And if it is deactivated can I reactivate it?

Thank you so much!

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1) not sure

2) Only Cingular has rollover

3) you wouldnt be able to make calls

4) WeLc0mE To ThE FoRuMs.. Make sure you read over the F.A.Qs and rules