There is a sensor problem in my sony xperia st21i

This answer is given by the owner when the smartphone is first activated. You need to find that owner?

I forget my password and I drawn my password 6 time now it locked my phone model no micromax a89 plz sotout my problem

Usually after entering the incorrect pattern five times it will lock up for 30 seconds, but it will also provide an option on the bottom of screen that says "Forget pattern?" You must enter your User name and password to reset the pattern.

Do you want to unlock your Sony ST21i Xperia Tipo mobile from any network ? ..If it so means you can do it by getting the unlock code and instruction from an online vendor like Mobile-unlocker.com .To get the code you need to submit your country name,network provider name and IMEI number.

hey and i love youi and you are nice

hai, i just factory reset my phone, and on the phone it ask pin no.
what can i do. my imei no is35380905-655069-9

you have to go local store to purchase cheaper spear parts if you send me your address I can help you to which market you have to go for cheaper spear parts

ur defalt phones codes is 12345 or 00000 u can use it
Default 4 Digit user code: 1234 or 0000
Default 6 Digit Security code: 123456 or 000000

Type *#06# at the mobile screen to know IMEI no of your mobile.
send the IMEI no to me and i will reply you with unlocking code.
IF Problem not Solved So
Please New Software install in the Phone Problem will Solved

If For puk & pin cod problem So Please
Very Best Solution:You Go To Service & Sim Office and Get The Puk code And Pin code From Office oprator
Enter The Puk code and Yes
Enter The pin code and Yes
So Puk code Open and Problem will Quickly Solved

If you're still having touch-screen problems with your Tipo, you might need the screen calibration patch.
Download this file:
http://www.4shared.com/rar/3p6YulVl/ST21i_calibrate.html
The file is the official screen calibration patch from Sony for issues with the touchscreen of the 2012 range phones (I'm 100% sure it works on: Tipo, Tipo Dual, Miro and Xperia J)