사용해보진 않았지만 

https://www.nerdwallet.com/utilities/cell-phone-plans

https://www.google.com/search?sourceid=chrome-psyapi2&ion=1&espv=2&ie=UTF-8&q=compare%20cellphone%20plans&oq=compare%20cellphone%20plans&aqs=chrome..69i57j0l5.7428j0j7