If you do remember your Gmail id and password then you can easily access your phone. (It does not require a net connection).

Otherwise, you can always go for hard reset. There are different ways to hard reset different phones. But there is a similarity, which I would be explaining below.
Note :This method would clear all the data stored on the phone.

Third party reference image
Otherwise, you can always go for hard reset. There are different ways to hard reset different phones. But there is a similarity, which I would be explaining below.
- Switch off the phone.
- Press power button and volume button together.(This is where different phone differs i.e. for many phones you have to use volume up key and for others volume down key)(In some phones pressing of home button is also required)
- A menu would appear
- Navigate with volume buttons
- Select with home button
- At first, clear data
- Then clear cache
- Reboot the phone
- Your phone would be unlocked
Note :This method would clear all the data stored on the phone.
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