This is not always true. Analog voice quality and reception can be terrible in many areas, it might have the most powerful signal that can drive through a mountain (and your braaaain.. lol), so you'll get SOME SORT of signal, but it won't be as good of quality as a PCS 1900MHZ signal would give you. Tri-Band will give you more signal to chose from, but the reseption could( hint, could) be poorer. (IE, get 1 bar of signal instead of 4)

I'd reccomend giving them a try, though.