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Holding the back button will toggle the multiwindiw on/off as long as you have it enabled on settings.![]()
Multi-window (not multi-screen) is a feature that comes with the 4.1.2 jelly-bean update.
You mentioned "I did checked setting and optiont multi screen is not there".
Pull down the status bar at the top of the screen. If you don't have the "multi-window" option at the top/right side when you pull down the status bar, then maybe you don't have the latest 4.1.2 update.
Go to menu/settings/about device/ and look for "Android version". If you do not have version 4.1.2, then go to menu/settings/System Update/ and try to update the software and Firmware.
After that you should be able to select multi-window from the status bar, and activate it by holding down the back-arrow button for two seconds.
I thought every carrier had that update by now....
Go to Settings, About Phone, Check For Updates :thumbup:
No I don't have that little option on my menu task and not in my menu as well. Is it bad?
Curious, what carrier are you on? Sorry if you mentioned it before

Youre welcome:beer:
Where did you get your phone? Did you buy it brand new directly from T-Mobile? Or did you buy it from somewhere else? Does everything else work? Are you able to connect to the T-Mobile network to make phone calls and go on the internet?
Maybe you can call T-Mobile and ask them why no multi-window. Better yet, take it to a T-Mobile store.
You also might try a factory reset. Just remember that this will wipe out your files so proceed carefully.