Last Monday, my younger brother lost his Google account. He was accessing his Gmail from a public internet booth and as per his knowledge, he had successfully logged out from the system. But when he tried to login to his email in the evening he got his account hacked and he couldn’t login to that account. After my arrival I tried to recover his password, but the hacker has already changed the secondary email address and also the phone number. I had applied to get back the access to that account by filling up the form. But this evening I got the reply from the Gmail team as follows:
Google’s Two Step Authentication System