Illinois cellphone taxes are highest in nation, average $374 a year By Brad Weisenstein 11/18/2019 Taxes alone hike the average Illinois cellphone bill by 31%. TAGS: 911 fee, 911 tax, cell phone tax, Center for Disease Control and Prevention, Chicago, Connecticut, constitutional amendment, emergency fee, excise tax, exit tax, Illinois, Illinois Constitution, JB Pritzker, Lori Lightfoot, middle class, municipal pensions, pensions, progressive income tax, Rahm Emanuel, sales tax, taxes, wireless tax