Unlocked Galaxy i7500, Reset Will Remove it? Possible Duplicate:
  Will resetting my unlocked phone to factory settings lock it again?  




I just purchased and unlocked a Samsung Galaxy i7500 using FastGSM's system. (It cost $20 and it's used up; I can't redo it.)

I know my phone has an option to "reset" it to the default/factory settings. Will doing so re-lock my phone? Is the lock hardware-level or OS/software-level? Can I upgrade the OS now that it's unlocked?

I noticed my app running a bit more slowly after unlocking, too... I just want to understand what level locking is on.
According to the FastGSM page: "Congratulations! Your phone is permanently unlocked and can use it with different network SIM card. It will never relock again even if you do software update." (source)

This means that even a factory reset won't relock the phone. I assume this is because Samsung phones use the /efs partition to store the IMEI and other network data, and the unlock modifies these files. The partition is not modified by updates/resets.