Verizon Wireless has filed a false advertising lawsuit against Alltel. In the lawsuit, Verizon claims that Alltel falsely represented its position as the only carrier to allow customers to alter their service plans without lengthening the terms of their contract. Verizon changed its policy in October, permitting customers to change their plans without penalty. It then notified Alltel that the ad was misleading. Alltel said it changed the ad, but Verizon contends that Alltel continued to run the ad for over a month after Verizon contacted Alltel. Damages were not specified.