[j. earl carter]

There are other polling problems

I would say people screeening their phone calls with caller ID is likely to be a bigger problem than cell phones.

[posterchild]

I would say people screeening their phone calls with caller ID is likely to be a bigger problem than cell phones.

That certainly has to eat into their success rate, though they can counter by autodialers which call many numbers and let the autodialer see who answers before placing a human operator on the call.

I've been cell only since 1998 and marketing calls have been extremely rare until about 2.5 years ago when I moved to another state and changed my number and cell provider. Now I get one a few times per year (not counting the obnoxious collection agencies calling for some woman who had this number over 2 years ago.)

I'll often check out numbers I don't recognize at http://whocalled.us

[xzins]

Excellent point. It adds to the likelihood that their numbers are skewed