This was an interesting one I found while surfing the next which is called web cramming. You may not know the term but I'm sure you have seen these online where you enter in your phone number to get to the website information.
The way the scam works is you enter in your information and you hit go. Your phone is sent a text and if you accept you get billed. The problem is getting off the billing system. Remember your phone can be billed so any site asking for your cell number beware.