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Re: unlocking a cingular razor for t-mobile
Your safest bet is to contact cingular for an unlock code. THere are also tons websites that are out there for unlock codes, most require payment.
Be careful if you use a website however... If the wrong unlock code is entered too many times the phone will be permanently locked to tmobile
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You do not need to unlock the phone in order to use another sim card with the phone. Just insert the card and as long as the card has been setup with your number, it will work fine. If the card asks for a pin code, you need to contact AT&T or T-Mobile for that code, otherwise you should be good to go. Let me know if you have any problems, or is I did not understand your needs properly, and I will walk you through the process.
sell the phone on e-bay and purchase a cingular phone. only t-mobile and cingular can be unlocked. alltell phone work on a differnet frequency and cannot be compatible with these carriers like yours. sorry.
the only reason that its not working is because Sprint locks their SIM cards so that you cannot use them on any other carriers. but it is possible. all you have to do is take the phone to AT&T and have them flash the phone to AT&T. another reason it won't work is because sprint is CDMA service, and AT&T is iDEN network and GSM. they aren't compatible. so you are unable to use the sprint SIM card in the AT&T phone. i am sorry.