There is an email getting spread around by lots of people that in a few days, telemarketers will get access to everyone's cell phone numbers, and that if you answer your phone you'll get charged.
This rumor is false.
When you hear something like this, especially when it's a forwarded email, always check snopes.com first. They have the real scoop on this, and show that this is a misunderstanding of what's going on with cell phone companies and directories.
I'm sure some scam will come along eventually to try to scam people using cell phones, but this time, at least, we're safe.