How do they do this......

The "free' ringtone sites have you put in your cell phone number online and a confirmation code is sent to your phone. When you enter it online, you are agreeing to a subscription and the service charges 9.95 a month to your cell phone bill.

http://www.flycell.com/offer/?ref=40...utm_medium=cpc

How do they do that?

How do you set something like that up? I can't find any information online.

Same sort of thing with this site....

http://www.41414.com/?gclid=CODzlfrgoYoCFSQkGAodrW-Gug

It's a reverse auction site where you bid by phone and your phone is charged 99 cents per call.

Where can I find info on how to do this?

American Idol - you "text" your vote to a number and your phone is charged.

Any idea what this technology is called or what search terms I should be looking for to get more info on this?

Thanks,

Jim