As I drive to work, I usually call a friend in Tennessee. I'm in Arizona. Sometimes I have a great signal and all of a sudden the signal gets crummy or I may get dropped. I understand about switching cell sites but I have a question. If my signal to a tower is below a certain threshold I've herd CDMA or 4G will drop me for another caller with a better RSSI. Is that true?

Also, My one site at work is a old Alltel site that was 4G equipped but not enabled until after Verizon bought out Altels operation in Arizona. I was told that the 4g equipment was "first gen 4G" and the signal suffers due to the fact Verizon has not updated the hardware, just used what was there.