Radio Shack (or at least my local one) is now offering a true signal booster for handheld cell phones. The attachment to the phone itself is just like an external antenna (which, as mentioned only serves to move the signal outside the car, etc. and does not boost). Anyway, the attachment is from the handset TO an amplifier which is about the size of a decent sized paperback book...then on to an external antenna. Granted, not practical for walking around, lol, BUT, quite nice for car installs. Boosts the signal back up to the old bag phone days.

I can't recall off hand who the manufacturer is....most likely Wilson, but I'm not sure.

Harley