Use travel data without missing your usual calls and texts.
1
Settings → Cellular
Pick your travel eSIM as the mobile data line.
iOS usually names the new line “Personal”, not “FairWave”. Go to Settings → that line → Cellular Plan Label and rename it (e.g. “FairWave”) so you can tell it apart from your other eSIMs.
2
Tap your travel eSIM and turn on “Data Roaming”
That is how it gets a connection in your destination country.
3
On the same screen, keep your home SIM for calls and texts