I know it's silly to most of us here, but a lot of people don't like change. They won't know that all Android phones have the same underlying structure. It is the icons they are familiar with. And familiarity alone could keep them coming back to Verizon.
My dad still pays for AOL because he is familiar with the AOL browser (and never stops complaining about it - but won't even try anything else). He has had cable internet for 5 years and still pays AOL $25/mo.
I once thought I was being helpful and simply aligned the scattered desktop icons on my dad's PC. He went bat shit crazy in a way I didn't even know he was capable of. I can't convey how pissed he was because now he "doesn't know where anything is". Same icons. Same labels. Just lined up.
These, unfortunately, are true stories.