The Doximity iPhone app has been updated to v2.0! (full disclosure - I serve on the Doximity Medical Advisory Board). So, if you haven't tried the Doximity app on your iOS device - now is a good time to give it a try.
I've been using Doximity on both my Android and iOS mobile devices for quite some time. I enjoy reading the interesting discussions on iRounds where I see familiar faces and colleagues posting questions and responses to these questions.