Yes, there are some wireless phone carriers that do offer discounts on select phone plans for AARP members. At the time of this writing, it was found that Consumer Cellular offers a 5% discount on monthly plans, as well as a 30% discount on certain phone accessories. In addition, this wireless phone carrier extends their money back guarantee an extra 45 days for AARP members. AT&T also offers discounts for AARP members; they can save 10% on select plans, 15% on some accessories, and get the activation fee waived.
Please keep in mind that AARP senior discounts change frequently, so it is always important to research your money saving options. At the time of this writing, no discounts on cell phones for AARP members could be found.