Recently, I came across to a few android applications which promise cost free access on the internet with a strange VPN connection. The main idea behind this, is the user has 0.00 balance in his/her pay-as-you-go sim card and no available traffic. Here comes a strange application which creates a VPN under the android settings and does connect to a remote server through mobile data (even if the balance is definatelly 0), and after a few seconds the user has access to the internet!! I was left stunned as i cannot explain how some people can really bybass the carriers billing systems. What the theory/technology behind this?