1. Check for an “Add eSIM” option
On iPhone, look in Cellular/Mobile Service settings. On Android, the wording varies by manufacturer, but look for SIM manager, mobile network, or an option to add a mobile plan or eSIM.
2. Check the device identifier if needed
Many eSIM-capable phones show an EID (Embedded Identity Document) in device information. The presence of an EID is a useful indication that the device includes eSIM hardware, although menu availability and regional variants can still matter.
3. Confirm the phone is carrier-unlocked
A phone can support eSIM hardware and still be locked to a carrier. If the device is locked, adding a travel eSIM from another provider may fail. Check the carrier-lock status in your settings or with the carrier that sold the phone.
4. Watch for regional model differences
Two phones with the same marketing name can have different SIM capabilities depending on the country or hardware variant. Check your exact model, not only the product family name.
5. Do not assume tablets and watches behave like phones
Some tablets and watches support eSIM but require special carrier provisioning or do not accept the same travel eSIM products designed for smartphones.
If the phone has a visible Add eSIM flow, an EID, and no carrier lock, you have the key signs needed before shopping. If any of those are unclear, verify the exact model first.