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Can I lock android phone to one network? If can be unlocked if I have both lock and unlock code?

I want to lock my android phone to use only one network.

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This question seems a little unclear to me. What do you want to achieve / what is the specific problem you want to solve? Can you add some use case and more information? – ce4 Aug 27 '12 at 19:47
Hummm... +1 to ce4's comment - you have this question tagged as both sim-unlocking and bootloader-lock - which is it? – t0mm13b Aug 27 '12 at 19:58
I can only presume that the OP wants to send in their phone for technical support and doesn't want to make it apparent that they've unlocked their phone. – Chris Jester-Young Aug 27 '12 at 20:54
something like that :) – leki Aug 27 '12 at 21:08
@leki: Would you edit your question to better reflect your problem? Without knowing which model you actually have: Not possible (without enumerating all models). Some unlock attempts are reversible (Google line up), most are not (Sony, HTC,...) or at least are rather unfeasible... Search xda for this. – ce4 Aug 27 '12 at 21:41

If you're talking about sim unlock, it is possible to re-lock it back to the network as was often the case with old nokia dumb-phones. However, I have not seen this in practice with most phones now-a-days. Usually, once it is unlocked from the network, any sim card can go in place and use it.

However, if you're talking about locking the boot-loader - then that's a different thing altogether, hence my comment above to ask for clarification. In this case, you can re-lock the boot-loader, depending on the manufacturer and the procedure used originally.

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