Hi, I'm new to the forum. I live in the Rocky Mountains, in an area where cell reception is spotty. I'd like to kiss my landline good riddance and do all my phone business with cellular AT&T. In my home, ATT is weak, but always strong enough outside. I've been considering installing a repeater in my home. Maps show that both 850 and 1900MHz are used in my area. Buying a single-band repeater is considerably less expensive than buying one that will work both bands. All my phones are dual band. Can I get by with a single band repeater? I've exhausted the limited expertise of local ATT reps. Can anyone advise?