At Ethereum we travel a lot. And we struggled to find a solution for mobile internet while traveling. If you have a high-end Android there are options like Google Fi, but even that requires a United States data-plan. We were so happy to discover AIRSIM from Singapore's Shinetown Telecom. In short, you buy one of their AIRSIM cards, before you take off you purchase (via PayPal) a data-package for your destination country. When you've arrived at your destination, swap your local SIM for the AIRSIM, reset the SIM, wait five minutes, and you're good to go.
Each SIM purchased from us comes pre-loaded with $15 USD for your first purchase.