Last time I tried Verizon was 2 years ago at my old place. Did not work indoors so I switched to ATT. I would rate my iPhone 4 performance indoors to be OK. It works sufficiently but does breakup at times. I am at a new place now so I wanted to give Verizon another shot. Again, Verizon does not work at all indoors. Outside it gives me poor 3G data, and OK LTE. ATT iPhone 5 seems to work better than iPhone 4. It works flawless indoors, gives me fast LTE indoors and also gives me fast 4G indoors. Does CDMA simply not work as well inside concrete structures? The Verizon phone will be going back, the ATT will be staying. One thing that the rep at Verizon suggested was a network extender. Seems odd that in both cases where I have tried Verizon I have had issues given that there are many satisfied customers.