WiFi's really cool - if it works for you.
Right now there's no good nationwide network of Wifi providers. The Portland Airport doesn't have have Wifi The San Jose Airport uses Wayport, while the San Francisco Airport uses TMobile (which is widely available in Starbucks, etc). This situation is somewhat mirrored nationally. Some regional chains are now offering free Wifi with purchase of sandwich etc. So does Fast Eddy's in Moab.
So getting to the point, it does rock to just walk in plop down and spray on cc , but check to see if service is available, or coming, to where you want it.