cell phone usage -how will it affect us?

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Did you know there are more home with cell phones only than those with home phone only, in the USA?

I suspect it is trending this way in Canada and other countries.

How will this affect telemarketers?

How does it affect our communications techniques? For instance, I am now calling my daughter or my son-in-law, instead of whoever answers the phone at their place.

Why have both a home phone and a cell phone?