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This question already has an answer here:

I bought an unlocked android phone at Amazon and it works perfectly. This phone in particular doesn't have any OS updates I could do (Motorola Defy), so basically I am stock with Froyo unless I flash it with a custom ROM with an newer android version. The phone used to be locked to T-Mobile's network, so my question is: since my phone is currently "network unlocked" if I flash it will it re-lock again?

I appreciate any help and guidance. Thank you.

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marked as duplicate by Matthew Read Mar 9 '13 at 16:46

This question was marked as an exact duplicate of an existing question.

up vote 0 down vote accepted

No, flashing a ROM on your unlocked phone will not re-lock your device. I have several unlocked phones which I flash ROMs on to without any issues. The SIM code which operators use to limit what SIM cards will work in your device has nothing to do with the software running on that device.

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Thank you very much for your answer!! – Brian Oct 24 '12 at 14:58
Don't forget to mark this as the correct answer if you're happy your question has been answered, so other people with a similar question can easily see the status of your query. – Martyn Oct 24 '12 at 15:05

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