Hi, I currently have Verizon and I am thinking of switching to fi. Verizon removed my $25 more everything line discount when I added my 6p to the plan and so far everyone I have talked to refuses to put it back on. My question is that I work in the basement of a hospital so I have no cell phone signal at work and I put my phone into airplane mode to save battery. Since fi will work over WiFi for calling and texting do I need to still put my phone into airplane mode to save battery? Will the phone keep looking for cell reception or dinner it has a strong WiFi signal it will stick with that? Also is there a way to keep my line open to switch back to Verizon if I don't like the service with fi? T-Mobile just moved to this area and I don't know how sprint service is around here. Thanks for the help.