It is illegal for telemarketer to call your cell phone. This is per the Telephone Consumer Protection Act of 1991. That law prohibits solicitation calls where the recipient is charged for the call. This act has no expiration, so the protection of cell phones from telemarketers will remain intact until the law is changed (which is not likely).
The Telephone Consumer Protection Act is not the "Do Not Call" list. You do not need to submit your cell number to the "Do Not Call" list to have protection. "Do Not Call" list is legit, of course, that that is mostly for landlines, not cell phones.
The is an urban legend going right now right now online that is trying to scare people into submitting their cell numbers to a scam website. If you receive that email, do not go to the email's link. Do not forward that email on. It is an attempt to steal information.
The FCC wants anyone who has received a telemarketer call on their cell to report it to them here: http://esupport.fcc.gov/complaints.htm