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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.

  • @MatthewRead possible. I would still like sn answer specific to my phone if possible though.
    – ashes999
    Commented Oct 4, 2011 at 23:47

1 Answer 1


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.

  • Okay, thanks for interpreting that for me. I had read that prior to unlocking, but I'm not clear on software vs. hardware as it pertains to locking.
    – ashes999
    Commented Oct 5, 2011 at 13:42

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