Here is a tip that I’ve received via email from 5 different people:

In a few weeks, mobile phone numbers will be released to telemarketing companies and you may get Sales Calls on you cell phone (as is you didn’t get enough on your land line!)

To register your phone with the national Do Not Call list,
1. from the phone you want to register (land line or cell phone), call 888-382-1222.

2. follow the voice prompts

Doing this should block your number from Sales Calls for 5 years.

You can file complaints at DoNotCall.gov