Antenna Boosters for Cell Phones?

Hollinger asks: "Earlier this summer, I bought a brand-new Samsung 8500 PCS phone. It looks great, sounds great (more on that in a sec) and is very small. However, I have one problem. I thought that my new apartment was in the middle of a PCS deadzone. However, friends with other model phones (less expensive, mind you) can get a good, clear signal. This leads me to wander about the signal strength of my own phone. I've been shopping around to see if anyone has reviewed any of the 'Internal Antenna Boosters' that I've seen ads for, but I can't find any. Has anyone on Slashdot tried one of these? Do they work, and if so, how well?"