There is no call forwarding option on my iPhone 13

Can someone please read this carefully? There is NO CALL FORWARDING OPTION in Settings-Phone so telling us to go there and select what isn’t there is not helpful.

Set up call forwarding and call waiting on iPhone

You can set up call forwarding and call waiting on iPhone if you have cellular service through a GSM network.

If you have cellular service through a CDMA network, contact your carrier for information about enabling and using these features.

1. Go to Settings  > Phone.
2. Tap any of the following:

• Call Forwarding:  appears in the status bar when call forwarding is on. You must be in range of the cellular network when you set iPhone to forward calls, or calls won’t be forwarded.
  • On models with Dual SIM, choose a line.
• Call Waiting: If you’re on a call and call waiting is turned off, incoming calls go directly to voicemail.
  • On models with Dual SIM, call waiting works only for incoming calls on the same line, unless the other line has Wi-Fi calling enabled and a data connection is available. See Set up cellular service on iPhone.

Who is your carrier?