Yes, data roaming must be enabled to use the KnowRoaming eSIM.
For iPhone users
- Please go to Settings > Cellular > Turn on "Data Roaming"
For Android users
- Go to Network & Internet > Mobile Network
- Tap the active eSIM > Enable roaming
Disclaimer: Settings instructions and appearances may vary depending on the cell phone brand
Remember to turn data roaming OFF when not using the KnowRoaming eSIM