Power off the phone, put in a sim from another carrier, enter your unlock code when prompted to do so.
Where did you get the unlock codes? Normally, only one code can sim unlock the phone.
i got the codes from unlock.my i used the network unlock code to use a different sim card but there is supposed to be a way to permanently unlock so that i can just put any sim in it and not need to do a network unlock everytime. the codes they gave me are:network unlock, provider unlock, sub provider unlock, and defreeze