Couldn't quite believe this one, so rang them up, and got £75 for nothing! As a member of the armed forces, you (and even five friends), can get free credit added to your account. I rang up, and they added £75 credit to mine. Not sure what I'll use it for, as all my minutes and texts are already included. Although I do occasionally get charged for picture messages, premium rate numbers, calling abroad etc. Get on it! O2 | Rewards, promotions & competition Terms and Conditions - Armed forces promotion Three cheers for O2! Cadet leaders and walts need not apply.