Call Directory Extension not working on iOS 18 – “Call Blocking & Identification” option missing in Settings (.NET 10)

[AzizBelAbed]

Description

The Call Directory Extension used in a .NET MAUI iOS app is not working on iOS 18. However, the same implementation works on newer iOS versions (iOS 26+), which suggests a platform-specific issue affecting iOS 18.
A minimal sample project reproducing the issue is attached to this report.

Steps to Reproduce

1. Create a .NET MAUI iOS app that includes a Call Directory Extension.
2. Deploy the app to a device running iOS 18.
3. Open: Settings → Phone
4. Look for Call Blocking & Identification

CallSampleApp.zip

Link to public reproduction project repository

No response

Version with bug

10.0.50

Is this a regression from previous behavior?

No, this is something new

Last version that worked well

Unknown/Other

Affected platforms

iOS

Affected platform versions

iOS 18

Did you find any workaround?

NO.

Relevant log output

[sheiksyedm]

@AzizBelAbed Is this issue reproducible only on a real device, or does it also occur on the simulator?

[AzizBelAbed]

@sheiksyedm Call Directory Extension isn’t available on the simulator, it only works on a real device.
Are you experiencing the same issue?