Since 11 December 2003 it is unlawful to send an unsolicited SMS marketing message to an individual. If you would like to complain about the receipt of such a message please contact the Office of the Information Commissioner. If the message contains a premium rate number contact ICSTIS. You will find contact details are under useful links
above from the Telephone Preference Service click here and click here links to OFCOM, The Infomation Commissioner and ICSTIS
at least if we all report spam texts we will hopefully be helping to end them.