AT&T covers 97% of Americans - How?

Lets try to calculate how AT&T covers 97% of all Americans?

• Subtract all legal and illegal immigrants - They are not Americans
  
• Take a good percent of Bay Area and Places in Connecticut and NY out where the service sucks.
• Buildings where Americans work and can't make a phone call because of lack of signal. They work 1/4th of the day in these buildings so take 25% of all Americans in these buildings out.

So at any given time I think AT&T may only be covering 50-60% of all Americans instead of 97% as claimed.