Remove an eSIM only when you've finished with the plan. Once it's removed, it usually can't be installed again.
- iPhone: go to Settings > Mobile Service (Cellular in the US), tap the eSIM, then Delete eSIM.
- Android: go to Settings > Network & internet > SIMs, choose the eSIM, then Erase eSIM. On Samsung, go to Settings > Connections > SIM manager, choose the eSIM, then Remove.