Need Menu(Option) Button. How to I Get This Button.

Iam Used Samaung old Android 2.3 Mobile Phone That phone was a Button Name of the button ““Menu(option In App) Button””

Showing This Button Screen In This Type:-

““Menu,Home,Back""

But Now this button was Vanished Updated Phone.

New Updated Phone Button Type.

““Recent,Home,Back””

But I Need Menu(Option in App) Button.

Please help.