I've only seen it once.

I was doing some work in a small-ish county jail/sheriff's office in the States. As part of that work, I needed some Internet access.

Because jail (thick, reinforced walls and lots of steel) the cell phone coverage was basically shit -- otherwise I'd have just used my phone like I would normally have done approximately anywhere else.

It was a fun dance: Requesting access via wifi, getting sent a code via SMS, and then going outside, turning off wifi to establish an actually-working network connection, retrieving the code (yay Google Voice), and then going back inside, turning on wifi, entering the code, and actually using it.

There was some other detail (perhaps relating to very short timeouts or re-registration issues or MAC randomization) at some stage of the operation that seemed extra-insulting, but my mind has forgotten whatever it was.

I have no idea what this song and dance was intended to provide, prevent, or enforce.

> I have no idea what this song and dance was intended to provide, prevent, or enforce.

Describes far more corporate IT policy than it ought to.