Bing maps are available on iPhone, via various browsers, but only the aerial view and road views using Open Street Map, which does go right down to individual houses and streets. You can toggle traffic, which is handy, but it’s odd that the OS mapping is available in iOS on the Pad, but not the phone.
It would be hugely useful to have access to it on the iPhone.
I was still using ViewRanger 2018 on my phone up until very recently, but the app had done a space saving thing and removed itself from my homepage and it’s no longer available on the App Store. I’ve still got it on my iPad, though.