I c hanged my lock pattern and can not remember what it is, how can I get into my phone?
keep trying to enter the unlock pattern. After a certain number of failed attempts the phone will force you to re-enter your google account password which will allow you back into the phone. Then you can disable the security pattern or change it.
If mikewithe's suggestion does not work, or if you are unable to remember your Google password, you will have to do a master reset with the hardware keys in order to access your phone.
Retrieving data ...