Comment Samsung SCH-A930, on Verizon (Score 1) 584
At my last job, we used pagers rather than Cel phones. They worked pretty well. I belive the company we went through was Penncel (or pensel, cant remember).
My current job is also an oncall position. We use Verizon wireless phones. My current phone is a samsung SCH-A930. Works very well as a pager. Has a few loud ring tones, and verizon's firmware lets you set the alert on text messages such that it will re-alert if you don't ack it.
That being said, there's a good chance i'll be switching to a PDA type phone in the future. I hope i can find one that works as well as a pager, as it does a pda.