I've tried it all: international SIM cards, "WiFi only" on airplane mode, and international call/text packages, so when T-Mobile came out with their new international features I had to try it out.

Anyone who has traveled internationally knows that you have to get creative with your smartphone abroad in order to avoid sky high roaming and calling charges, and T-Mobile's plan doesn't charge for "roaming" off of WiFi.

I needed to upgrade to an iPhone 6S anyways, and switched from AT&T to see for myself what the fuss was all about.