Almost every guide answers this with a list of model numbers, which goes out of date and misses the part that actually catches people out. Two different things have to be true, and a phone can pass one while failing the other. It is worth checking both in the five minutes before you pay rather than at an airport gate.
- eSIM support and carrier unlocking are separate checks, and both must pass.
- Your phone can tell you directly—no model list required.
- A phone bought on a contract or instalment plan may still be locked.
Ask the phone, not a compatibility list
Every eSIM-capable phone will offer to add one somewhere in its own settings, and that is a more reliable answer than any published list. On an iPhone, look under Settings, then Mobile Service or Cellular, for an option to add an eSIM. On Android, look under Settings, then Network and internet, then SIMs, for a plus button or an option to download a SIM.
If that option is missing entirely, the hardware does not support eSIM and no plan will change that. If it is present, the hardware side is settled and you can move on to the second check.
Carrier locking is the check people skip
A locked phone will refuse a plan from anyone except the carrier that sold it, and it will do so after you have paid and installed. This catches people who bought the handset on a contract, an instalment plan, or a carrier trade-in, because those are the arrangements that usually come with a lock.
The phone can often tell you this too. iPhones show a carrier lock status under Settings, then General, then About. Many Android phones expose the same information under status or SIM settings. If it is not shown, your carrier can confirm it, and will usually unlock a device once it is paid off.
What a passing check does and does not promise
A phone that supports eSIM and is unlocked will accept the plan. That is a different question from whether the plan covers where you are going, or whether the phone supports the network bands used there. A very old unlocked handset can install a plan correctly and still get poor speeds abroad because it lacks the bands the local networks use.
- The settings app offers to add or download an eSIM.
- The device reports no carrier lock, or the carrier has unlocked it.
- The plan lists every country on your route.
- You know what starts the plan's validity clock.
If the phone is not eligible
A physical SIM bought at the destination remains a perfectly good option, and so does a small mobile hotspot device if several people are travelling together. Neither is a lesser choice—an eSIM is convenient rather than magic, and the convenience is not worth an unreliable connection on a trip that matters.
Sources and further reading
Device menus and features can vary by model, software version, region, and carrier. These official guides were checked when this article was published.