we noticed your traffic has a high percentage of a non normal device distribution.
Most of the traffic is coming from (e.g. iOS 8.0) whereas the amount of traffic from is expected to be very small. In comparison we don't see this with other partners running the same offer / country as you do. Large amounts of old OS Versions are not normal. Please refer to the official distribution graphs from Apple / Android.
Android Distribution by OS
Non organically shapped Device Distributions are related to fake installs or bot traffic. Given the high percentage of this in your traffic, we cannot pay for this. If you have any doubts you can manually verify your data using Excel or simply using a text editor to look at the OS distribution of your traffic.
Please exclude this source from future traffic.
Click here to open this template in your Email Client. If you want to learn more about Abnormal Device Distribution please click here.