In reply to mike123:
There is a text number you can get from vodafone to forward anything you consider spam to them. I guess if they get significant numbers, from lots of people all saying this is spam they then take action.
My policy on text and email is never to respond in any way. Block it or report it as spam but otherwise do nothing. Replying and or calling the company concerned may do nothing other than turn your number from one that was randomly generated and may not exist/be in use into a more valuable commodity of being one that is genuine, that is then sold on all over the place.
For what its worth, I seem to go through periods of receiving spam, sometimes the same, sometimes using different angles (loan, PPI reclaim, write off debts, been in accident etc) for a few days, I report them all, and after a few days it goes away, for days, weeks or months, then it flares up again. A scurge and curse of modern life.
Only exception to above is if you actually know the sender is a legitimate firm from my own experienec... if so I call them and give them hell as I never allow my email/phone numbers to be used so the spurious 'you are recieving this because you opted to recive' stuff drives me nuts. If I don't know the sender I do not call as no way am I proving I exist to a spemmer.