So while exercising, my shorts have a nice internal little pocket right on the hip so I can slide a phone into it, and it stays stationary (ie doesn't bounce around with running etc) and is unobtrusive. However my wife is struggling to find something that works for her (to carry her phone) - it seems womens exercise gear doesn't come with something similar (often no pockets except for a rear one which will hold a key but not much more). 

What options are there out there? She can wear a bag, but its a bit cumbersome and dominating. I know there are the arm band pouch things too. Do people have any experience and/or recommendations on what they have used? 

fwiw - she has an iPhone7, so needs to fit with that.