I previously had the samsung galaxy s4 with tmobile now I have the samsung galaxy s5 with verizon, and I don't see much of an upgrade. A major issue I'm having is that when I'm on a phone call and someone else calls me, I can't pick and choose which line I want to disconnect from. If I hang up, both lines shut off. Is this a Verizon thing? Because it's really annoying. I get a lot of phone calls, and I use 3way Features very often; so this is a major issue. Can this be fixed?