You bring a personal laptop to work with you?

I have been working from home for the last 8 years but when meeting the team onsite I have seen people bringing small personal laptops and ipads so it seems quite common. Those days at the office were so sporadic that I could do with my smartphone only.

I've never seen anyone do that across almost two decades in tech, it's a security risk that would absolutely get you the wrong kind of attention in an organization that takes itself seriously.

Personal laptops go on guest wifi with zero access to company resources, just like personal phones

+ everybody working in tech has a large mobile data plan, no reason to even connect to the wifi guest network.

+1, guest network is risky. Even VPN/ts is risky, since you're actively hiding what you are doing. Mobile data only.

So I assume your company that take itself seriously ask you to leave your personal smartphone at home.