iPhone cellular data not working and E-Sim isn’t showing up

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.

The answer might seem overly simplistic, but if you are having a problem with your cellular connection, you need to first contact your carrier to have them check things out.