Blackberry OS 10 has an integrated hub for all communications as well. I've never tried Windows Phone, but I can't see anything me much slicker than that. Didn't do them any favours either, and they started off with a larger base. The lack of an app ecosystem, and some unfounded sentiments of it being obsolete did them in.

I'm on my 2nd BB Classic, and will likely stock up a couple more to last me some years, as there's no better phone for email and ssh. And the few apps I do need that aren't supported I can still run using the Android runtime.