Encryption. Using a secret key, the data is encrypted. To decrypt it, the same or a different key is needed. Unauthorised entities should not have such a key.
greatflombles or gr8flombles or go2flombles
Check below your score it should say something out of 5 you need to get more to get 5/5
It all depends on the brand of phone to do it yourself but, you can call your cell company and they can do it for you through your account.
