Procedure to hard reset or solve pattern lock problem in xperia Lt15i. By using this trick we can remove pattern lock without knowing gmail account or any box.There are some steps to do that.
Note: Make sure mobile battery is charged 90% and take backup of your important data contacts and messages.

Lets start
Turn on mobile (mobile show google account lock)
Emergency call Enter this code *#*#7378423#*#*
after pressing key display show four option

*service info
*service setting
*service texts
*customization setting

Choose "Customization Setting"

Then press "Reset Customization" phone will reboot & reset.

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