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try this, it should work for the samsung sgh-a137. First insert the T-Moble SIM in phone, at WRONG CARD screen ENTER on the keypad *2767*3855# (wait 10-15 seconds) phone will reboot(restart) When phone completes reboot ENTER *7465625*638*00000000*00000000# NEXT ENTER #7465625*638*00000000# AND THEN *#7465625# to check the locks....all locks are inactive...these are all the locks... network lock - inactive subset lock - inactive sp lock - inactive cp lock - inactive sim lock - inactive activa lock - inactive phone lock - inactive auto network - inactive auto subset lock - inactive auto sp lock - inactive auto cp lock - inactive
The PUK (Personal Unblocking Key) code is entered incorrectly multiple times. This can inactivate the SIM card. If inactivation appears to be permanent, contact your operator or service provider for a new SIM card.
A. Turn on phone with full battery and non-T-Mobile SIM in place. Allow phone to completely boot up to Wrong SIM screen.
B. Enter from Wrong SIM Screen
*#7465625# to confirm lock status
C. Scroll through Interrogate Screen
1. Network lock - Active (this is the one you'll be deactivating) 2. Subset lock - inactive 3. SP lock - inactive 4. CP lock - inactive 5. SIM Card lock - inactive 6. Activa lock - inactive 7. Auto network lock - inactive 8. Auto subset lock - inactive 9. Auto SP lock - inactive 10. Auto CP lock - inactive 11. Auto SIM Card lock - inactive 12. Phone lock - inactive
D. Push "C" button under navigation button to clear Interrogate screen back to Wrong SIM screen
E. From the Wrong SIM screen enter the following:
*7465625*638*00000000*00000000# Those are two series of eight zeros. The phone will not show the zeros but will show dashes in their place.
Phone may make a small tone and at the bottom of the screen it will read "Network Personalized" or perhaps "Network Already Personalized"
F. Now input the following from whatever screen shows up:
#7465625*638*00000000# (again this is a series of eightzeros)
Phone may make small tone and will read "Network Lock Deactivated"
G. Turn off phone H. Re-start the handset and allow it to reboot. J. Enter from Standby Screen
*#7465625# to confirm lock removal status
K. Scroll through Interrogate Screen
1. Network lock - inactive (note that this lock is now inactive) 2. Subset lock - inactive 3. SP lock - inactive 4. CP lock - inactive 5. SIM Card lock - inactive 6. Activa lock - inactive 7. Auto network lock - inactive 8. Auto subset lock - inactive 9. Auto SP lock - inactive 10. Auto CP lock - inactive 11. Auto SIM Card lock - inactive 12. Phone lock - inactive
That's it. Your phone is ready to accept SIM cards from just about any GSM mobile telephone service provider in the world.
If you received a "wrong password" message you will need to insert a working SIM and reset the password to the default 8 zeroes "00000000". After that you may try this process again and it should work.