I run three devices concurrently on three different lines - an iPhone 5s as my primary device, a BlackBerry Q10 as secondary, almost exclusively now to access the Crackberry forums, and an SGIII occasionally to access a WhatsApp group I'm on.
I use my iPhone because of the fluidity, consistency of experience, and stability of both the device and the OS. I bring out the SGIII when I want to play phone geek. Over the last few months, as I used other phones, I kept wanting the iOS feel and the RELIABILITY of my iPhone. Finally, I bit the bullet and just accepted the fact that my iPhone is the phone that works best *for me.* I'm not saying it's better than my SGIII or my Q10; I'm saying that for the things I do and the things I want and the things I value, iPhone works, every day, all day, no drama, no surprises, no let downs. OK, so I can't change themes. OK, so I can't use live wallpapers. OK, so the file management system needs improvement. Fine. That's all true. But what I get when I grab my iPhone is a sense of satisfaction with the device that I just don't get elsewhere. Most important, I KNOW the device will be on. It won't have rebooted, it won't have bricked or nuked. It's there, working, as it should.