A few months ago I was invited to join Project Fi, Google’s wireless carrier experiment. International Data (certain countries) is included with your plan. There are no extra fees for SMS or data usage.
Project Fi reminds you of this benefit with a nice notification once you turn off Airplane Mode after landing.
Here’s what I got when I landed at Ninoy Aquino International Airport in the Philippines.

The Welcome to [Country]! is a nice way to start off the notification. Here’s what I got when I landed at Narita International Airport in Japan.

The folks at Project Fi know I’ll be taking my phone out of Airplane Mode. They know I’m in a different country. A notification is small thing, but context and timing is everything.