[phkamp]

Right, so when you're guest at a company you have to install their CERT on your device to use their guest-wlan ?

If you're an employee you have to put the company CERT on your smartphone ?

How does that improve your security ?

[snowwrestler]

Guests shouldn't be on the corporate network anyway. Either companies will provide a guest WiFi signal that is physically separate from the corporate network (that's what my employer does), or they will ask guests to provide their own connectivity via LTE.