In my area (DFW) I am on the fringe of 5 towers. While I am in my house my phone, S4, goes nuts and is constantly trying to find a stable signal from LTE (Band 26 is all I get with at best -115 RSRP)) to 1x1900 to 1x800. It's very annoying and drains my battery. I use wifi at the house for data so I switch my radio to CDMA only. When I do that I have a stable 1x800 voice signal. I'm almost certain the towers around me have been optimized as they have been broadcasting 800/1900 voice/data for quite a while now. I don't believe the signal will get any better, but am hopeful.