iPhone
Open Settings → Cellular or Mobile Data and check for Add eSIM. Menu names may vary by system version.

Prepare your connection before travelling. Check that your phone supports eSIM and is unlocked, then review your package instructions and validity start conditions. Install using an available method in your account and a internet connection. Configure mobile data and roaming as instructed, and keep the eSIM installed for future use.
Your phone must support eSIM and be unlocked for use with other carriers. Availability can vary by exact model and market.
Open Settings → Cellular or Mobile Data and check for Add eSIM. Menu names may vary by system version.
Open Settings → Connections → SIM manager and check for Add eSIM. Menu names may vary by system version.
Open Settings → Network & internet → SIMs → Add SIM and check for an eSIM setup option. Menu names may vary by system version.