Is your data connection working?
If its not then you have a huge problem then go to this webpage this may solve it or even not "
http://support.google.com/android/bin/answer.py?hl=en&topic=2500700&ctx=topic&answer=2569768 "
OR if you are agreed to lose data to gain access to your phone then get in the boot recovery of the phone.(different phones have different method to get in boot recovery.example- for samsung in switch off condition press "home" +"power key".then go to factory reset and select yes then your phone will be starting new with no lock.
OR
if you dont want to lose your data get "screen lock bypass" pro version to reset the PIN or lock. But its to late as it should be pre loaded!!
OR there are many ways but you will not understand just reset the phone!!
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