Spam in my mobile phone

Spam in mobile phone is very rampant nowadays. Every day I seem to receive one or two of adverts about sales, offers and events. My mobile service provider must have sold my particulars to the companies. Their act causes thise nuisance almost daily. I tried many times to sms back but could not reach them.

I usually ignore the alert but look at the SMSes later in case my friends do want to tell me something.