The best time to set up travel data is before you leave home. Start by checking that your phone is unlocked and supports eSIM, then choose a plan that covers the destinations on your itinerary. It is also worth checking how much data you normally use for maps, social media, video calls and translation.
Install the eSIM while you still have dependable Wi-Fi, but read the activation instructions carefully. On many phones, the eSIM can be installed before the trip and switched on when you arrive. Keep your primary number available for calls or verification messages if you need it, and label the new line clearly so there is no confusion at the airport.
Finally, save your booking details and important directions offline. A little preparation means your first connection abroad is something you can use immediately rather than another task to solve after landing.