Before I had even gotten through immigration I managed to pick up SIM card with unlimited* data and was back online. I grabbed my bag from the carousel and headed towards the train. There is a customer service centre just after customs with a big sign that says “There are more places to buy your ticket, including the destination station.” or something like that. I bought a ticket anyway and head to the platform. Exiting the customs area and into the arrivals hall they have giant TV screens showing the other exits passengers can come out, just in case people waiting for you are at the wrong one they can see you.