In a few weeks, cell phone numbers are being released to telemarketing companies and you will start to receive sale calls. You will be charged for these calls.
Call this number from your cell phone 888-382-1222.
It is the national DO NOT CALL list. It only takes a minute of your time. It blocks your number for 5 years. Please pass this on to everyone you know who doesn't want to be hassled.
Or you can go to donotcall.gov and do it on-line.