is it free? and how do you use the service?
you send an SMS to 1080 with the word "anon" (or anonymous?) followed by the recepient's number and the message, and it will be sent anonymously on your behalf.
I dont know if it's free. But I think radio one are offering this service, so they might actually offer it for free and cover their costs by having a database of numbers they may later use for sms advertisements (I hope I'm wrong!).
I'm a bit spam-paranoiac!