If your screen is locked then you need to enter in the password to unlock it. If you don't know the password then you will have to take it to the cell phone service provider that you have and have them assist you with unlocking the phone.
my samsung mobiles screen touch not working so i cann ot receive any call .please suggest me
Use Your Android Device If Touch Screen Is Not Working - BeQuench
A simple Guide On How You Can Use Your Android Device If Touch Screen Is Not Working Properly...
Visit: http/www.bequench.com/use-android-device-if-touch-is-not-working/
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