Maps, translation and booking apps are often the first tools travellers reach for after landing. Before departure, download offline maps for the places you will visit and save your accommodation address in both the local language and your own notes. Offline copies are a useful backup even when your eSIM is working perfectly.
Once you arrive, allow the phone to connect to the travel eSIM and test a simple web page before leaving the airport. Keep data roaming enabled for the travel line if the plan requires it, while leaving it disabled on your primary line if you want to avoid accidental roaming charges. The exact labels vary by phone, so checking the settings before departure is worthwhile.
Screenshots can help too. Save the first hotel address, transfer instructions and any booking reference somewhere accessible without a signal. These small backups make the first hour of a trip calmer and leave your data connection free for the things that cannot be planned in advance.