[esrauch]

Even assuming that such technology exists and is viable (which I really doubt considering the major telcos would easily be using the technology if it was the miracle cure that you are suggesting) the fact that a cell phone that doesn't work in different states much less cities is hardly a cell phone at all. If you can't even use the same phone at your workplace and your home then it isn't even a cell phone, it's a cordless phone attached to a landline.