You need to have a registered Google account on your phone in order to reset the screen unlock pattern. In case you do not have a registered Google account, You must repair the phone software before tapping "Forgot pattern". The phone is locked if the incorrect screen unlock pattern was entered fives times in a row.
Follow the procedure below to repair the phone software:
> Open PC Companion 2.0 on the computer, tap Start then Repair in the "Support zone" application and follow the instruction you see on the screen. Please note that all personal data stored will be lost and the installed software on your device will be replaced. In case it is not possible to repair the phone software, contact your Sony Customer Support.
If ever you entered the incorrect screen unlock pattern five times, tap "Forgot pattern" then tap "Answer question" then tap "Next" and enter your answer for the security question. Next, tap "Unlock".
To reset it using your registered Google account, tap "Enter Google accounts details" then tap "Next". Tap the "Username" then enter the registered Google account username. Next, tap "Password" to enter the registered Google account password then tap "Unlock".
SOURCE: sony experia st21i phone unlock password
To unlock Sony ST21i, visit Mobile-unlocker.com for which you have to provide which country you are,network in which it is currently locked.Then they deliver you the code to unlock your mobile and they also provide free instruction guide about how to unlock your mobile.
SOURCE: Pls Give me the unlock code of my Sony Xperia
Hi you can easily unlock your Sony ST21i mobile from network lock using sites like Unlock-Zone.com here they render unlock code for all mobile models at reliable cost ..You first check that whether they are rendering code for your country and network provider ..If yes then pay for it and unlock your phone ..
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