I have the Samsung Galaxy S6. The voice was fine until I just got this phone (previously had the S5), but I think it has something to do with the HD calls option. Regardless, my issue is mainly data related. This is an issue with every Verizon customer in this area. Whenever we come across another who is having weak signal issues, 99% of the time, they're a Verizon customer.
Update, May 2015: AmberF_VZW did a great job in trying to help with this issue; she even asked the engineers to look into this issue. Unfortunately the outcome, at this time, is that there isn't anything Verizon can (or will) do about it. A weak/non-existent data signal in this large section of South Pasadena (and consequently the Metro Gold Line) is...just the way it is. Disappointing? Very.