United Arab Emirates eSIM

Any time you're on Wi-Fi, before you go or once you're there.

Once it's installed, choose the eSIM for mobile data in Settings, then turn on data roaming for that line. That doesn't add roaming charges. It's how the eSIM joins a local network.

Yes. Your eSIM works alongside your usual SIM. Keep your number for calls and texts on your usual SIM, and use the eSIM for data.