Although I had used this app on a previous device (just for kicks), I was on an unlimited plan at the time so I honestly didnt care how much data I saved. Now that this is not the case I was excited to get more value out of the app, but it seems as though there is a disconnect during the setup. I get taken to a screen after the VPN profile is installed that says something to the effect of "just finishing up," and it just spins. Since the VPN is installed Im assuming it still saves data. But its almost as though the app doesnt connect to the VPN, and Im unable to monitor my savings. As a result I deleted the app. I decided to try again since some time has passed, and Ive been using more data than usual lately. But it looks like the issue has not yet been fixed. I dont know if there is some kind of compatibility issue linking to the device (iPhone 6S Plus whereas the previous device I used the app on was an iPhone 5), or the system (iOS 9.3 vs iOS 7 & 8 on the old device), but either way it needs to be worked on. Otherwise you might as well get rid of the app portion, and strip it down to the VPN.