I have an unlocked AT&T iPhone 6S Plus - I have tested with AT&T, T-Mobile and Verizon. One thing I noticed on Verizon - using the unlocked iPhone 6S Plus I am typically on Band 13 (which gives slower upload/download speeds in my area). My girlfriend's Verizon iPhone 6--when put side by side next to my iPhone 6S plus in the same location: 1. Her Verizon iPhone is on bands 2 or 4 (at 10 or 15mhz) 2. Mine stays on band 13 (slow, 5/10 mhz) Was curious if anyone here is using an unlocked iPhone 6S on Verizon and noticed they have slower performance/less signal than someone using an iPhone 6S for Verizon. Also the AT&T model has separate hardware to support band 30 and I wonder if this impedes on the signal picked up when using a Verizon SIM in this model? Has anyone done any comparisons in this situation?