> For extra privacy, I stopped my personal phone from connecting to the company WiFi.

In a large enough campus, wouldn't the company also operate the cell tower? (I feel like I should know this, but I don't.)

> Now I use a router-based VPN.

This is not really useful except as a way to make your internet really slow. VPN providers are a lot less trustworthy than ISPs, that's why they can afford all those podcast ads.

I use a VPN provider [0] located in my state. They claim not to spy and I believe them. My state (California) which has some privacy laws and consumer protection functions which would make things very difficult for the VPN provider if they were caught spying. I picked this VPN provider because they finance WireGuard development.

AT&T, Verizon, and other ISPs spy and sell the data they collect. They also spend large amounts of money influencing lawmakers to keep spying allowed.

[0] https://www.privateinternetaccess.com

Isn't laptop enough? What the phone does?

Some things I use corporate access on my phone for:

* Receiving pages when on call

* Team chat notifications

* Meetings while walking around the neighborhood

* Filing android bug reports

* Testing unreleased software