Is it true that if you only have cell phones, you won't be polled?

In general, it does, but this is coming to be less true because of one particular problem. Its the problem for people who have only cell phones, no land lines.

The reason this is important is because polling is typically done by calling land lines. When people have cell phones only, they cannot be reached by conventional polls. It is very expensive to do polls that include cell phone only people.

It means that cell phone only people tend to be different -- mostly younger and more educated -- than others. When they are left out, it skews the sample and it makes it harder to get accurate results.