Access to VoIP is in 95% of the USA’s zipcodes according to an FCC announcement.
This then means that VoIP is available in 95 percent of the USA. How the VoIP providers approach the one person in timbuktu versus the masses in the more densly high speed user communities is called marketing.
What I don’t see is really smart marketing going on by the smaller players. Some seem to start and end with the online universe. Others seem to go full bore with retail. Then others just seem to say “hi” we’re here.
The answers are obvious. If you want to know, just ask me.