There is no windows for phones (anymore). If you aren't using an apple phone, you are pretty much forced to use google's android (or one of the various linux phones with little financial backing)
Windows/Android can be considered a natural pair, Microsoft seem to think so. Personally use Linux/Android pair, and I've been vaguely considering switching to an iphone to avoid Google.
How do they integrate at all? Windows has ability to link to a android phone to view texts, place calls etc, but no such link exists for iPhones and Windows.
If I ever wanted to get into iOS development I'd probably purchase a cheap Macbook Air for the bare minimum of stuff and use one of the multiplatform SDKs that can produce iOS builds alongside every other platform
Windows/Android can be considered a natural pair, Microsoft seem to think so. Personally use Linux/Android pair, and I've been vaguely considering switching to an iphone to avoid Google.