The number of eSIMs that can be stored in a phone depends on the specific model and make of that phone.
Some phones are designed to support only one eSIM, while others can store multiple eSIMs. For example, the latest iPhone models (iPhone 14, 14 mini, 14 Pro, and 14 Pro Max) can store up to three eSIMs. On the other hand, the Google Pixel 6 and 6 Pro support only one eSIM.
To know the exact number of eSIMs your phone can store, you can check the specifications of your phone model or consult the user manual.