Why is my iPhone 5 sending data over cellular while on wifi using Vodafone Germany?

Hello,
I know that this is a common mistake on verizon iphone 5. i have the same problem with my iPhone 5 in Germany. It keeps sending data over cellular while I am on wifi. The wifi connection itself works though, even when I turn off cellular data. So my wifi is not broken.
Another thing that makes me curious is that my iPhone keeps sending data to somewhere and I don't know what it is sending. This led to the point that I reached my Monthly limit of 200mb within 2 days!!! And almost 95% of that was upstream. So I bought another 300mb and turned off cellular. Now I turned it back on and the megabytes are just running through. I thought it might be diagnosis and iCloud but I turned both off and it's still the Same way. Due to the enormous amount of data that is being sent the battery empties really really fast!! I was on a 20 minute car drive and my battery went down 23%!!! When I turn cellular off and use wifi it behaves completely normal.
So this is really annoying me and I hope that Apple will fix this or one of you guys can help me.
Best regards from Germany,
Sitham

You may have a problem with your WiFi network if your iPhone can't stay connected to it.
If you are having WiFi problems it is necessary to isolate whether the problem is with your network or your iPhone. Note: Do NOT consider your network to be blameless if some other devices can connect to it.
First, test your iPhone on some other networks: a friend's, Starbucks, Barnes & Noble, etc.
If it works well there then the problem is with your network. Try restarting your router by removing power for 30 seconds. If that does not help check for a firmware update for your router. If none exists which corrects the problem consider replacing the router.
If your iPhone does not function well on other networks it possibly has a hardware problem. Contact Apple Support or visit an Apple store for evaluation. They can provide a replacement if your iPhone is bad.
If you need more help please give the make, model, and version of your WiFi router and how you have it configured.

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