E15i patten lock - Sony Ericsson XPERIA X8 E15 Unlocked QuadBand GPS WiFi HSDPA Cellular Phone E15i Black

To enter unlock code to Sony-Ericsson E15i insert foreign sim card and enter received code. You can try only 5 times to enter unlock code. If X is on NETWORK and value is different than zero, you can unlock phone.
http://electronicshelponline.blogspot.com/

You can do a hard reset by holding the power and the vol+ simultaneously so it will go into a hard reset mode. You will have to run your factory reset from there. also, if the power+vol up combo doesn't work, try the power+vol down. One of those combos will get you to the hard reset option.
Hope this helps.

Do you want unlock your sony xperia mobile network lock pass code? Yes means you can visit this site Prounlocking.com here you can get the code and unlock your mobile. Getting the free mobile unlocking instructions from this site Mobileunlockguide.com .This instructions is very useful to unlock your mobile.
MobileUnlockGuide.com

Hi is your sony ericsson E15i xperia mobile is asking for network lock passcode once you insert your sim in it then it mean the phone is locked to some other network provider due to this it wont accept any other GSM sim until you unlock it ..You can easily unlock the phone through online providers like ProUnlocking.com here they are rendering network unlock code for all mobile models at reliable cost ..You first check that whether the code is available for your country and network provider .If yes then pay for it and unlock the phone then freely use it with any GSM sim ...

If you want to unlock your Sony Ericsson E15i Xperia mobile phone from the network lock,I would suggest you to get an unlock code from Mobile-unlocker.com at reasonable price.

Go to settings, lock screen, screen security, and you can select "None" if you want to turn off the lock screen.

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check out these sites not sure on how safe they are ????
https://sim-unlock.net/simlock/Sony-Ericsson/E15i/
https://www.freeunlocks.com/unlock-SonyEricsson-E15i