i have jailbrokin and unlock my iphone 3gs 3.1.3 and my t mobile still dos not work?

By what mode did you unlocked your iPhone? If you have unlocked your phone perfectly, then it must work with any GSM SIM card.If it doesn't work properly, Then there must be any mistake in unlocking process.
You can try unlocking your iPhone 3GS through remote unlocking method. It is the safest and easiest method to unlock any iPhone. It is also an affordable method too. You can get the remote unlocking for your iPhone from www.classicunlocking.com with easy unlocking guide. All the best mate.
 
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