via Solvate

This is the conclusive, exhaustive and painfully detailed how-to-set-up-your-iPhone-to-go-abroad-so-as-to-not-add-several-decimal-places-to-your-at&t-bill. Google “iPhone data bill abroad” to find some horror stories from the less fortunate.

Want to avoid a similar fate while you are abroad? Solvate recommends you only bring your iPhone with you if you are visiting countries that are all covered under an at&t international data plan– and even then only with meticulous preparation, and if you plan to use it sparingly.

Click here for the full rundown on how this complicated issue works.