The worst part is that "Spock phone home" moment meant absolutely nothing. You can remove it and it changes nothing about the rest of the movie.
Maybe. But it still ends up being a small bit of fun.
I like Spoony's take on that scene
[34 minute mark, warning: language]
Is the scene needed? No. But it's a bit of misdirection too, cause you think they're setting up for Spock to be the one to die.