How do I change to Just one number
How do I remove dual sim
iPhone 13 Pro Max, iOS 15
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See the following from About eSIM on iPhone - Apple Support
Erase your eSIM
If you need to erase your eSIM, follow these steps:
- Go to Settings.
- Tap either Cellular or Mobile Data.
- Tap the plan you want to erase.
- Tap Remove Cellular Plan.
If you erase all content and settings from your iPhone, you can choose to erase your eSIM as well or keep it. If you want to cancel your cellular plan, you still need to contact your carrier.