That's sort of what I do. Well...my S7 and S7 Edges actually give me better more clear connections more often than my iPhones do. For reasons I don't know. So on the rare occasions I'll be on a long call, like to my parents, I use my Samsung or my HTC 10, which is also good.tempted to start a new contract with EE..never had them before but i plan on using two contracts my iPhone for my calls and texts then S8 plus for general notifications and media...hmmm
I prefer the mail app that Samsungs have preloaded. So I split doing my emails between iPhone and Samsung, with the lions share done on Samsung. Texting goes to iPhones, easily. Media is actually a pleasure on my 7 Plus, too, surprise. So I split between them, but gaming is something I'm more prone to do on a Samsung because I get a lot of discounted hidden objects games from Amazon.
E-reading I like better on an LCD screen so most often I use my iPhone for that.
Using forums seems to go smoother on Samsung. It is definitely fun to switch back and forth between the two. Well for me it is. It might drive some people up a wall.