I have bought a used Xperia X10 for development. It is locked to a network provider, and I need to unlock it. It does not show an option for a passcode or unlock code.
Is there any other way to unlock the phone?
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Each mobile phone has an unique unlock code.
You can buy the unique unlock code for your Sony Ericsson Xperia X10 mobile phone in Unlocking4U, and follow their free instructions to get free from the locked network.