How to unlock or switch back to nam1 on samsung smooth?

Chimee

New member
I accidentally switched my cell phone from nam1 to nam2 and now its stuck on nam2 because it keeps asking for an unlock code that i dont know what it is....its a samsung smooth/sch-u350...is there anywhere for me to switch back or reset my phone so i can use again? And i tried all the codes i could think of so i need another way of fixing the problem.
 
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