This app was mentioned in 4 comments, with an average of 2.00 upvotes
Slingshot is a great app. Far more powerful than the Nikon WMU app.
https://play.google.com/store/apps/details?id=com.BrainyLantern.slingShot
Even at $10 it's a good value for everything it gives you. There is a demo version to try it out.
I dont know if its possible on iphone but it is on android.
You need the wifi nikon dongle and a app like this https://play.google.com/store/apps/details?id=com.BrainyLantern.slingShot
I use the same app on my d5300 and really love it and think its much better then the official nikon app that is straight crap.