Short answer: many older Android phones and some regional variants do not support eSIM.
Common cases
- Older Android phones released before eSIM became common.
- Many budget or entry-level Android models.
- Some regional versions of otherwise compatible phones.
- Phones that are carrier-locked or have eSIM disabled by the carrier.
How to confirm
- Open Settings.
- Search for eSIM.
- Check whether you can find Add eSIM, Download eSIM, or Add mobile plan.
How to read the result
- If an add-eSIM option appears, your phone probably supports eSIM.
- If there is no eSIM option after searching Settings, your phone may not support eSIM.
- If your model should support eSIM but the option is missing, update Android, check whether the phone is carrier-locked, and confirm whether your regional model supports eSIM.
If your phone does not show any eSIM option, do not purchase a 4S eSIM for that device until you confirm compatibility.