March 2019 I decided to go backpacking in Yucatan Mexico for the second time in my life and of course I bought a sim card to avoid high roaming costs. That is what I would recommend every tourist to do when traveling to Mexico. Buying a sim card in Mexico is easy and straight forward and can save you a lot of money. In this guide I will compare all the available Mexico prepaid sim cards and point out the best one for traveling. UPDATED January 2020!