I have an android, so can't comment on apple, would love to try Airalo myself, but it seems my phone doesn't take e-SIM, it was the last model built without that function, so I'm out of luck there.

I do have a dual-sim card slot and 4 Simcards from 4 different countries. If you're traveling to Europe, I highly recommend picking up a Simcard in a cheaper destination.

Mine's Greek and it's cheap, great coverage and I could use it all over the EU including the UK, no roaming.

Pay 15 euros 1 month, plenty of data for me when I need it.

Great strategy on Skyscanner by the way. I do the same)

Good luck!