Sony Xperia M4 Aqua

Find "Screen lock"

Slide two fingers down the display starting from the top edge of your phone.
Press the settings icon.

Find "Screen lock"

Press Security.

Find "Screen lock"

Press Screen lock.

Select option

You can create several types of phone lock codes. The following steps show two examples:
Create phone lock code using a pattern, go to 2a.
Create phone lock code using a PIN, go to 2b.

2a - Create phone lock code using a pattern

Press Pattern.

2a - Create phone lock code using a pattern

Press and drag a point to connect at least four points.

2a - Create phone lock code using a pattern

Press CONTINUE.
Repeat the selected phone lock code to confirm.

2a - Create phone lock code using a pattern

Press CONFIRM.

2a - Create phone lock code using a pattern

Press the required setting.

2a - Create phone lock code using a pattern

Press DONE.

2b - Create phone lock code using a PIN

Press PIN.

2b - Create phone lock code using a PIN

Key in the required phone lock code and press CONTINUE.

2b - Create phone lock code using a PIN

Key in the phone lock code again and press OK.

2b - Create phone lock code using a PIN

Press the required setting.

2b - Create phone lock code using a PIN

Press DONE.

Turn off use of phone lock code

Press None.

Return to the home screen

Press the home icon to return to the home screen.