Just to be on the safe side, I think you should read my post on whocallsme-there is a kind of scam targeting cellphones that automatically sends them premium SMS one right after another. It is activated by replying Stop to the SMS instead of having it deleted safely by your service provider. To block the services the scammers use, do a reverse number lookup on whocallsme for 447773744001.
Please do this right away. You may be in danger of losing money to the scammer.