Option 1: Enable
Settings > Location > Use Location > Slide to the right to Enable
Option 2: Disable
Settings > Location > Use Location > Slide to the left to Disable
Note: Make sure permission to access location has been allowed in Apps too. Settings > Location > App permissions > Select the App you using with your location > Allow while using the app.
Note: Once the phone is turned on, it may take up to 30 minutes for the phone to show a good location fix.
Tip: For best location accuracy, the phone should need to be outside with a clear view of the sky.