Most devices will allow you to store multiple eSIMs (often 5 to 10), but you can only use one eSIM at a time unless your device supports multiple eSIMs.

Currently, only several devices support multiple eSIMs. (With iPhone 13 Pro Max, iPhone 13 Pro, iPhone 13, and iPhone 13 mini, you can use Dual SIM with either two active eSIMs or a nano-SIM and an eSIM.)