There are over 600 million people using WhatsApp. Odds are your friends and family use it. So when you're abroad, why not save yourself typical SIM fees and grab a WhatSim instead. This single SIM card works with over 400 operators in roughly 150 countries, letting you chat over WhatsApp free of charge. If you want to send more than just texts, you can buy credit packages to enable sharing of photos, videos, voice messages, your location, and contacts quickly, easily, and affordably. And when WhatsApp adds support for voice calls, it'll support that too, making it a one-stop solution for overseas communication.