Watch out for the club scam. Once you sign up they keep charging £3 each week until you "unsign". Our lad got stung quite badly when some "friend" signed his phone up to one which downloaded jokes to his phone.   He didn't realise what was going on but every time he tried to top up his phone credit, the "joke subscription" used up all the credit he put on the phone.
Be Warned.
Quack!
GtD.