I found out by having been recently sent random messages by Vodafone and trying to reply from the same 'page' only to get another message saying that my message or the number was not recognised and could not be sent so I dialed the number from the keypad, chose 'send message' typed STOP in the text box and send, message then come back telling me that message successfully sent. I think it also said that the messages would stop within the next 28 days, I'll believe that when it happens! Another devious way Vodafone trys to extract money from you, there's lots of things they are very secretive about but we're beginning to suss them out!
