Editor’s Note: Brenden Mulligan is an avid traveler and entrepreneur who created Onesheet, Webbygram, TipList, ArtistData, MorningPics, and PhotoPile. You can find him on Twitter at @mulligan. 

In my opinion, the smartphone is the greatest travel tool ever created. They enable you to be in a completely foreign place, yet immediately have access to maps, directions, restaurant recommendations, and more.

Unfortunately, consuming data while roaming tends to get extremely expensive very quickly. Recently, U.S. carriers have become a lot more reasonable with data plans, but it’s far from perfect. Usually, you pay about $25 for 100 MBs of data. In comparison, Verizon charges $70 for 4,000 MBs of data in the U.S. So 100 MBs tend to get used up quickly, especially if you use media-intensive apps like Instagram, Facebook, or Path.

In addition, international calling and texting plans tend to be really expensive, even if you aren’t actually…

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