Unlocked iphone 4s not activating after i put t-mobile micro sim card?

I bought an At&t iPhone 4s and got it unlocked and jailbreak from some person. That person also cut the t-mobile original sim for me and put it in my iPhone 4s. That same day my phone was working with tmobile network but text messages weren't going through. So i called t-mobile and they told me to dial some codes and after that iPhone text messages started working but they did not tell me it was temporary. So every time my iPhone will turn off and when it turn on again i will get the same error messages saying text messages can't be send. So i called t-mobile again they told me to go get a new mircosim card and discard the original cut one. I did that yesterday and since then my iPhone keeps on saying Activation required Sim not Valid. I called T-mobile again they told me i might have gotten a defective sim so i went again and got the sim changed. But still the same message. T-mobile said i should contact apple but i know they will void my warranty because my phone is jail broken. So what should i do and who should i contact please help?

Trade it on craigslist for a unlocked iphone 4s.
if your in PA i have a factory unlocked 4s, id trade cuz i only use att.

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