Just bought a factory unlocked iPhone 4?

I just received the phone I bought from ebay. I went to the T-Mobile store to get a SIM card. Everything was set up but it says "No Service". I looked up the solution but nothing really worked. I put on and off airplane mode, it says searching then quickly goes to "No Service". I set it up with iTunes too and it said "Congratulations, you have successfully unlocked your iPhone". I also restored it about 2 times. I called and they didn't help. I tried another SIM card and it didn't work as well. Any suggestions?

There's not much they can do over the phone. You should bring it into a store

T-Mobile service is really spotty and T-Mobile doesn't guarantee service indoors. Are you sure there's service in your area? Http://www.t-mobile.com/coverage/pcc.aspx/

Iphone might have been reported lost or stolen and barred from all carriers.

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