Usually, we can use the network of a specific mobile operator on a single SIM card, and in that case, also physical SIM is required. But e-SIM does not have that problem. This means that no physical SIM card is required as well as you can uninstall the current running SIM and take the network service of another SIM operator at the same time. But If you use Oppo F21 Pro, you will not get this feature.
Actually, this feature does support a few smartphones. eSIM doesn’t support Oppo F21 Pro. To get the benefits of the eSIM feature, your phone must be supported eSIM functionality. So, you won’t be able to use the eSIM feature on Oppo F21 Pro.