There are some great responses to the topics in here
Just want to add my two pennies
-If you guys are all using the same username\password to access wifi, then no, they cannot tell specifically who is doing what; but as said earlier, your MAC address (and if you're broadcasting your hostname e.g. "Mark's iPhone") is what identifies you on the network.
-Not a big deal unless you signed one of those new-age corporate electronic device agreements I see companies make their employees sign to use workstations and internet access...
-Most companies have a proxy server that logs all web traffic. Your MAC can be searched and your web logs recovered. As said earlier, don't do anything on company wifi that you wouldn't do on your workstation
I normally don't connect to my work wifi through my personal devices at all. If I do, I VPN into my home internet connection and do my surfing from there (if 4G service is bad)
Hell, I'm usually the network guy
but even for personal internet surfing on a corporate workstation, I normally RDP into my home PC, or set up a proxy in IE/Firefox/Chrome to redirect all internet traffic from my browser to my VPN tunnel- All they (well, we
) can see from my workstation is encrypted network traffic