Ok,Sure you can unlock the Sony Ericsson W910I from the Network lock,To unlock the phone from the network lock,you can use the unlock code,To get the code You can reach here
Ihav.net buy the code at reasonable cost and Unlock it using the instructions below,You need to find that Network it locked now,then get the code....
Sony Ericsson W910i Unlocking Instructions
Warning : Do not enter any wrong unlock codes on your Sony Ericsson W910i mobile phones. If you enter over a certain amount of wrong unlock codes on your Sony Ericsson W910i mobile phone, your phone may get hard locked and sometimes become unusable.
1 - Switch ON your Sony Ericsson W910i
without any SIM Card,
2 - Press the
left arrow key/button
once,
3 - Press the
button * twice,
4 - Press the
left arrow key/button
once,
5 - The message "Personalize with MNC2" will appear, (or you will have displayed an unlock menu, select the lock you want to unlock)
6 - Enter the Unlock Code.