If you are worried that telemarketers can get a hold of your cell phone number you can place your number on the "National Do Not Call" registry.
You may have received a forward stating that telemarketers will soon have access to your cell phone number because of a new cell phone database.
According to the National Do Not call registry web site, that is not the case. The FCC regulations keeps telemarketers from using automated dialers to call cell phones. You have been able to register your cell phone since 2003 with the registry. To ensure that you will not receive phone calls from telemarketers you can register a cell phone or home phone at any time.