A travel eSIM only works on a phone that is carrier unlocked and eSIM capable. Good news: you can check both in your Settings in well under a minute. ✅
In this short clip we open the right screen, read what "No SIM restrictions" means, and confirm your iPhone can add an eSIM profile at all.
Locked device? Your home provider can usually unlock it free of charge once your contract allows it. After that your JamboSim eSIM installs like any other.
Settings › General › About, under Carrier Lock. "No SIM restrictions" means you are good to go.
iPhone XR/XS and newer support eSIM. You can also check Settings › Cellular for an "Add eSIM" option.
Better to unlock first. Ask your provider to remove the carrier lock, then install your eSIM — otherwise the profile installs but cannot connect.