Here is how to UNLOCK your samsung T309 (T-mobile) ...now you can use it w/ any GSM service Provider!!! I HAVE PERSONALLY done this and I KNOW IT WORKS...

1. PUT IN A SIM CARD THAT IS NOT A T-mobile sim card!!!!

2. at the "wrong card" screen press *2767*3855# and let it reboot(restart).

3. It will start up and it will look like it is unlocked but ITS ONLY TEMPORARY!

4. Now press *7465625*638*00000000*00000000#....some message will pop up and disappear...

5. Now press #7465625*638*00000000# and a message about network lock INACTIVE..and now your phone is UNLOCKED FOREVER!!!! (your welcome!)

6. to make sure its unlocked press *#7465625# ...this is only to check...this code doesn't do anything else....don't need to do this step if you don't want to..

I took some time to help you with this SO PLEASEEEE vote "YES" for me before closing this page...thanks again!!!!!!!!!!!!!!!!!!!!