This is a very nice mentalism routine that can be done anytime anywhere, as long as you have your cell phone with you. The instruction covers all you need to know to make this effect a reputation maker.
It loses a star for two reasons:1) the setting has to be right in order to get the maximum impact. If the surrounding is too noisy which in my work environment it is, and I don't get much chance to do this for any group larger than 3. not everyone will know what's going on. Unless you have a very loud speakerphone on your cellphone, this shouldn't be a problem. Besides, this is a great effect that should be performed sparingly. 2) the special number you dial for this effect will last until mid-2009 (May, I think). After that, it may not be available unless Mr.Becker and Mr.Earle decide to renew the serve on that particular number.