For android phone and android tablet users, we need to be careful for clicking advertisement in our android apps. You may be charged without any permission or confirmation after clicking some advertisement. In some worse case, it may automatically subscribes to some value add services from your local telecom company. For services providers, this kind of AdMob ads against the term of use of AdMob and auto-subscription maybe illegal depending on local law. For common users, it can be a very irritating experience. Usually we can not get our money back when we find out we are charged without permission. This is not a assumption. It just happened in India. This is the snapshot of that Ads