Bought a used "Verizon" 650 to try out a smartphone, before spending big bucks. I checked software to see if an upgrade was necessary and found that, while the front and back of my phone say verizon, and I can make and receive calls on Verizon, the software is SPRNT 1.12 (or some such number). The Verizon 1.05a update won't download onto my phone.
Two questions:

Can I fix that?
Does it matter (I'm hoping for better voice quality, if anything)?

Help, and thank you