IPhone 4 stuck in activation process?

I recently bought an "Unlocked" iPhone 4 off ebay. Big mistake and regretting it now! The phone came working, but l originally have T-Mobile so l needed to cut my sim card. I messed up and just planned to get a new one. But l needed to update the iPhone software since it was old. And when l did so l found out the phone was actually jailbroken. So now that it isn't factory unlocked it is stuck in the activation process and says "Activation request could not be completed. If the problem persists, please contact customer care." I'm super confused and ldk what l should do now. Is there a way that l will be able to get it working for T-Mobile WITHOUT hacking and jailbreaking.l would rather have it factory unlocked so that way when l update it it won't erase all the jailbreaking apps.

Sorry but your gonna have to jailbreak because that's the only way you can get to the home screen and if you wanna get a factory unlock your gunna need your imei # which you can't get if you don't have access to the homescreen and you can purchase a factory unlock from unlock_fusion at eBay he has great customer reviews and I used him myself but make sure it is an AT&T iphone

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