The folks at Consumerist have put together a quick, handy guide listing the places you need to go in order to score an employer discount on your wireless service.
For example: If you think you might be eligible for Verizon discounts, check out this link. If you are with AT&T, this website is where you can check on your status. Hit up Consumerist to find out information on other providers like T-Mobile and US Cellular. [Consumerist]