I stayed in the waiting room throughout the entire operation, leaving only briefly for a few breaks. But during those breaks, I told the desk where I would be. The last time I had a hospital provided pager. Your cell phone will probably have to be turned off while in the hospital because it interferes with a lot of things that go on in the hospital.
You never know when the surgeon will want to contact you, so don't go anywhere without letting the waiting room staff know, and don't leave the premises.
I brought some CDs and a walkman player, something to occupy my time, some mints for dry mouth, some Immodium for nervous digestive problems, some change for coffee machines, a neck pillow to rest, something for headaches, and a sweater or jacket. I tend to get cold when nervous.