What is an eSIM?

An eSIM is a digital SIM that allows you to activate a cellular plan without using a physical SIM Card. 

Some devices can simultaneously accommodate an eSIM and a physical SIM or two eSIMs to have two wireless accounts with talk, text, and data on one device. 

The phone needs to be compatible with the Optimum Mobile network and unlocked if you want to use a second carrier on it.