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you would need the new network provider's SIM to unlock.
1. Change your phone's password back to 00000000 (8 number zero)
2. Power off your phone.
3. Take battery out --> take your T-Mobile SIM card out of the phone
4. Put ATT card in side the phone --> put battery back --> power phone on.
5. WRONG CARD message would appear on screen (in some case if the phone ask SIM unlock code , just put any number and it will show that message)
6. Enter *#9998*3323# and you see option exit ---> press right softkey to use function EXIT
7. After that one menu will show up, use arrow key go to number 6(or 7) Malloc Fail and use right softkey to choose this one.
8. Your phone will auto restart and now ATT network show on screen
* Until now your phone temporary unlocked ATT SIM CARD, to unlock your phone forever, please continue:
9. On screen, press *0141# and hit call button then screen appear "Persernalized"
10. Turn off phone --> take ATT SIM out --> put T-Mobile SIM in --> Power on
11. Screen ask " SIM unlock code"
12. Please enter 8 number zero : 00000000 ---> OK
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