looking at phones

Thinking and looking at smart phones, one interesting thing is that the 'back' button.

On i-phones, there is no back button on the phone so that the app for the user will need a back button.

But as for Samsung, there is already a back button on the phone where the user will go there automatically to go back to the page that they are on.

So now needing to think that if the user is downloading this phone on a apple I-phone or on a Samsung or an android phone.