The final way of mobile connectivity is to buy the subscription and get a special device that you can plug into your serial port. Now you can have broadband anywhere with no cell phone required. You can plug it into your home computer, then pop it into your pocket and use it with your laptop when on the road.
Another huge advantage is that you can plug the device into mobile broadband router and the all of the computers in the house are connected. This has made connectivity so easy that more people are leaving behind their land lines to go completely wireless. A Best Buy salesperson reported that in the past, he was selling 4-6 subscriptions a month for this service. That has shot up to 40- 60 sales a month now, and growing.
The are disadvantages to any style of subscription service. A hefty solar storm could knock out satellite communications for some time, and with it, web access. Spotty wireless service will give poor internet connections. And data security is always a concern
However, the idea of being able to connect anytime, anywhere is exciting. It will be interesting to see what the future holds for mobile connectivity.