eSIM is an industrial standard digital SIM that allows you to activate Cellular without the use of physical SIM.
You can install eight or more eSIM on an iPhone and use two phone numbers at once. You can activate eSIM on the above models of iPhone XS, iPhone XS Max, iPhone XR.
How to install eSIM on iPhone?
eSIM is usually installed according to the new iPhone on and the screen instruction. You can activate your eSIM when you turn on your iPhone, in the adhesion if your carrier supports eSIM Carrier Activation or eSIM fast transfer.