Iphone 4 completely unlocking a semi unlocked?

I bought my iphone 4 from USA! It was semi unlocked! And by chance i forgot it's password!
what do i do first factory reset it? Or completely unlock it and then reset it! It has ios 5 but i don't know about the baseband as it is locked and the settings can't be accessed

Then now from the shop which you bought it go to there and tell him the matter they will tell you the solution and it should be a experience too for you to do not forget your password other time try to be very cautious.

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