How about a Windows Phone? I know security through obscurity is generally not encouraged, but the fact is that the majority of exploits target iOS and Android, because the WP market share is so tiny that it's just not worth trying. That counts for something.
I've got a Lumia 925 running Windows Phone 8.1, and a 640 running Windows 10 Mobile. Coming from iOS it'll take some getting used to. I'll try and be as unbiased as possible here:
PROS:
- fast, intuitive UI
- email, whatsapp, spotify all available
- no slowdown over time
CONS:
- lots of big apps missing
- No official Google apps (you can use gmail, but only
through the stock email app. Youtube is basically just a shortcut to the site)
- Sometimes - no often - you get a 3rd rate app experience, as companies put less effort into the apps for the shrinking market. for instance, slack is a packaged web app on WP, but I'm pretty sure its a native app on both iOS and Android.
- limited hardware choice.
- no third party keyboards (but the stock one is, IMHO, one of the best mobile keyboards I've ever used)
- speech recognition is inferior to Android / iOS
- tied to MS services (OneDrive, Bing etc)
I miss trying out the latest apps. When some new todo list app is announced on HN, it's never available for me. I feel left out at times.
The flipside of this is that I don't get sucked into playing Pokemon Go, or Minecraft, or browsing Pinterest. I switch to android for a few months after my last lumia broke, and I wasted so much time with my head buried in apps I would have never used on WP. I recognised this and switched back.