To ensure your phone is E-SIM compatible, please check one of the followings,
For Iphone:
- Go to Settings > Cellular/ Mobile Data> and look for "Add e-SIM" or
- Go to Settings > General> About> and look for "EID".
For Android:
- Go to Settings > Connections (or Network & internet) > SIM card manager, and look for an "Add eSIM" option or
- Go to Settings > About Phone > scroll and look for an "EID".