Why is my mobile number incorrect on my iPhone?

Try a Reset All Settings (No Data is Lost) : When prompted to Keep eSIM choose Keep.

This resets all your personalized features back to factory defaults

Go to Settings > General > Reset > Reset All Settings

• What this effectively does is to reset some of your Settings to factory default. It’s not a complete removal of settings. It removes all of your preferences for Wi-Fi, Bluetooth, Do No Disturb, Notifications, General, Sounds, Brightness & Wallpaper and Privacy.
• Resetting all settings also reverts all your personalized and customized features like wallpapers and accessibility settings back to factory defaults.
• Performing this action does not impact any of your personal device data, including photos, videos, notes, messages, reminders, emails, calendars, texts, documents, and other files

Where, is the phone, right now? Did you call yourself? It, will due whatever, it, wants too. I even heard of people, who die!