My sprint unlocked iphone isn't working

I just recently unlocked my sprint iphone 4 with the GPP sim, i placed both the gpp sim and my tmobile sim inside and i'm able to call and receive calls and also receive text however i can't make any texts or browse the web. It kept saying i had no cellular data. I looked thru youtube videos and did the whole apn change and everything however when i go to setting then general then cellular i have no option for cellular data network AT ALL! Its not even there so i can't enter anything… And when i turn on my phone it says" waiting for activating, this may take a few moments" however it has being saying that for the last two days… Anyone help? Should i try straighttalk or net10?

That is because Sprint needs to unlock the phone. If they do not do the unlock, the APN setting ability will be locked out.

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