No disrespect meant to Jerry, but this scam has been going around for quite a few years now. Whether it be a do not call website or a phone number to call, they've all been scams when related to cell phones.

Before giving your cell phone number to someone for this, I would suggest contacting your cell phone provider to see that this is the case.

In the past, these have been elaborate phishing scams to get you to give them your number. The websites have even looked official with ".gov" at the end.

At the very least, wait and see what happens after the five days have passed.



***Here's something I found when googling that number:
http://urbanlegends.about.com/od/bus..._directory.htm