iphone 4 no service warranty question

Iphone 4 No service/Warranty question??
location: modmyi.com - date: January 25, 2011
Im having a issue here.. I have a iphone 4 4.2.1/3.10.01 I had it tether jailbreak and was waiting for the unlock.. But earlier today, I left tmobile and got with ATT, when I made it home and did a restore with itunes.. Thought everything would go find, but um I was wrong.. Now Im getting No service with Att Sim. I went to Att and they turnoff the phone and turn it back on and it worked for like 2mins with 1bar.. Now all Im getting is No service did all the trouble shooting resetted network settings and even rebooted and did another restore.. Just keep giving me No service.. Any help would be appreciated.. Also I have the white iphone 4 and I heard dat voids ur warranty, so should I just replace it with black housing and file for exchange??
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