My daughter wanted to play this on my iPhone while we were waiting somewhere in our car . The app is infested with annoying ads. Sometimes they are very hard to get rid off.
When I took back my phone after 10 or 15 minutes, I noticed an sms message, saying that I had subscribed to Pro Battle Zone for 10 euro per month which will be billed to my mobile phone subscription (not my credit card!). The subscription is handled by e-bill.mobi
I really tried immediately to cancel the subscription, even tried multiple times, but it was a very complicated procedure involving multiple sms messages and websites and when I finally managed to log in to the website where I supposedly could cancel the subscription, the overview remained empty on my iPhone.
When I got home and restarted the entire bothersome procedure all over again, this time on my windows pc with firefox as browser.
This time the overview showed the subscription and I was able to end it.
So I guess this was a 10 euro lesson that taught me to NEVER EVER AGAIN install this dangerous app.