Since eSIMs can be topped up after their plans expire (and cannot be recovered once they've been deleted), it's a good idea to never delete your eSIM unless you're sure you'll never want it again.

But it's fine to disable an eSIM, since it can always be reenabled if you want it back ...

How to disable an eSIM on an iPhone or iPad:

1. Go to "Settings"

2. Select "Cellular" or "Cellular Plans"

3. Select the eSIM you wish to disable/turn off

4. Toggle "Turn On This Line" to "OFF"

How to disable an eSIM on a Samsung device:

1. Go to "Settings"

2. Choose "Connections"

3. Select "SIM card manager"

4. Disable the plan with the toggle switch

How to disable an eSIM on a Google Pixel:

1. Go to "Settings"

2. Choose "Network & Internet" 

3. Select "Mobile Network"

4. Select your eSIM and toggle "Use eSIM" off