what iphone models can use an esim

All these iPhones will have eSIM feature --> iPhone XS, iPhone XS Max, iPhone XR, or later with an exception given below...

eSIM on iPhone is not offered in China mainland. In Hong Kong and Macao, iPhone 13 mini, iPhone 12 mini, iPhone SE (2nd and 3rd generation), and iPhone XS feature eSIM. Learn about using Dual SIM with two nano-SIM cards in China mainland, Hong Kong, and Macao.

All iPhone models that support eSIM can have multiple eSIMs and use Dual SIM with two active SIMs at the same time. You can use Dual SIM by using a physical SIM and an eSIM. iPhone 13 models and later also support two active eSIMs. iPhone models without a physical SIM tray support two active eSIMs.

Using Dual SIM with an eSIM - Apple Support (IN)

Using Dual SIM with an eSIM - Using Dual SIM with an eSIM - Apple Support

An iPhone XS, iPhone XS Max, iPhone XR, or later with iOS 12.1 or later feature Dual SIM with a nano-SIM and an eSIM.1 An eSIM is a digital SIM that allows you to activate a cellular plan from your carrier without having to use a physical nano-SIM.