Reseted my unlocked iphone 5, now i have no service?

I resetted my iphone 5 (because i didn't have alot of room so i was lazy to delete stuff) the phone is factory unlocked ( not sure which is the original carrier, i bought it from some guy on craigslist months back) i've been using it for tmobile sense. Ok after i reset it i poped my sim card back in my phone and sense then its been reading "No service" please help me i don't know what to do

The phone was temporarily unlocked with software. When you reset the phone, you lost the lock and your phone is locked to it's original carrier. You need to get the phone factory unlocked if you want it to be permanent. If you need help with getting the phone factory unlocked, mail me for references.

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