[phones] How to enable/disable Developer options

How to enable Developer options?

1. Go to Settings > About phones > Software information > Tap Build number 7 times.

2. Once enabled, you can find it by going to: Settings > System > Developer Options.
 

How to disable Developer options? (also removed from the page of Settings)

1. Go to Settings > System > Developer options.

2. Toggle the switch at the top to Off.