Make sure your iPhone 13 is connected to Wi-Fi
Go to Settings
Tap Cellular or Mobile Data
Tap Add eSIM or Add Cellular Plan
Scan the QR code from your carrier, or enter the details manually if provided
Follow the on-screen prompts to complete activation
If prompted, choose a label for the eSIM line
Set your default line for calls, messages, and data if needed
Restart your iPhone if activation does not complete immediately
Contact your carrier if the eSIM does not activate