On October 16, 2013 two laws will change. Cellular phones cannot be called from an auto dialing system without express written consent.
And  EBR Exemptions for Robocalling residential landlines no longer apply.  Even accidently breaking one of these rules – like calling a cell phone number without express written consent – can result in fines of up to $16,000 per violation. About 1/3 of all US households are now wireless only residences. How will you reach out to your customers? The key here will be to ascertain which phone numbers you have that are actually cell phone numbers. Once that is completed there are several different ways to achieve what the FCC deems acceptable “express written consent”.

For more details: www.fcc.gov