Do you need a back button on the iPhone? Most apps have the swipe feature to go back or you can use the <previous app link in the top bar. Unlike on Android the back swipe gesture in iOS is very consistent.You are right. I was mixing in other button functions. Thanks.
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Yes however those are additional functions. Namely "Back" and "App Manager". My Note 5 has a Home Button as does my son's Note 4. Other Galaxy phones have them. Wish my iPhone 6S+ had the "Back Button". Sweet feature.
Still, we digress. Hope you are enjoying your device.