I founded this issue long time ago and still not fixed, problem is app tracking feature and vpn it use. Turn off apptracking/vpn connection and its fine. People should only use this feature if you got unlimited data plan.
Makers dont care as mailed them thia issue and put review about issue in appstore. As I got unlimited data for years I dont care but I understand people with limited data would like have warning about this.
I do not get it why it can not track data from device it self. Why must it go trough vpn to get data? Iphone at least van see data usage from phone self why not show that usage in app?
I bet use the data gathered with vpn to sell it to third party.
Thanks for sending us the feedback. If you have the App Tracker enabled, My Data Manager might appear to use more data than it actually does in iOS settings. The App Tracker uses a VPN configuration to calculate data usage of other apps on your device. However, the data used by these apps might wrongfully appear to be used by My Data Manager. This data is counted twice in your iOS settings, once for the apps that used it, and once for My Data Manager. However, you will not be charged for it twice by your mobile operator. Note: My Data Manager is designed and tested to have minimal impact on your data usage.
Customer support service by UserEcho