Will eSIM work on my phone?

Two answers decide it: does the phone support eSIM at all, and what does the destination's catalogue entry demand of it. Both come from primary reading — the maker's own specification for your model and the operator catalogue, dated on every country page.

Where the answers come from

The eSIM floor — «An iPhone XS, iPhone XS Max, iPhone XR, or later» — and the two-active-eSIM threshold — «iPhone 13 models and later» — are quoted from Apple's own support articles, read for the iPhone eSIM hub. APN and activation-clock facts come from the operator catalogue, checked on the date shown on each country page. For Android, eSIM support varies by model and market — this page says so instead of pretending to a list nobody publishes.