Hi I'm novice developer.
I’m currently developing a phone number blocking app using a Call Directory Handler Extension. The blocking feature works perfectly on iOS 18.5, but it doesn’t seem to function properly on iOS 26 beta 4. The extension is invoked, and the numbers are passed correctly, but incoming calls are not being blocked as expected. Is there a known issue with CallKit or Call Directory Extensions on iOS 26 beta 4
Yes, it's a bug in iOS 26 Beta version, check this out: https://developer.apple.com/forums/thread/794740
Yes, it's a bug in iOS 26 Beta version
It is a bug, but including the full international area code (which is what you should already be doing) may get things working even in the beta.
__
Kevin Elliott
DTS Engineer, CoreOS/Hardware
It is a bug, but including the full international area code (which is what you should already be doing) may get things working even in the beta.
I tested this extensively and can confirm that using full international area codes doesn't fix the blocking issue.
Great Thanks to @DTS Engineer, @Papaductions .
I tested at iOS26 beta 5, but it still happens.
So, I hope this is resolved in the iOS 26 GM/official release.