If you want to stick with a major carrier such as AT&T, Verizon or T-Mobile, one easy way to save is to take advantage of its discounts. All of the carriers offer additional discounts that you could be eligible for, depending on your employer, military status, student status or age. First responders, military members, veterans, nurses and teachers can get discounts on every major carrier. Verizon has discounts for students, while T-Mobile's Work perk could knock $10 a month off a Magenta Max plan. AT&T offers a similar program for its Unlimited Elite and Premium plans that it calls Signature and recently rolled out a new promotion for teachers that offers 25% off its latest unlimited plans. If you're 55 or older, you may also be eligible for a discounted plan: T-Mobile offers discounted plans nationwide for as low as $55 a month for two lines, and Verizon and AT&T offer similar options -- but only for Florida residents. We've also rounded up the best plans at the Big Three.