Call blocking using a third-party CallKit app is not longer working with the latest iOS 26 Public Beta (23A5297m).
We've tried several different Call Blocking apps (that used to work fine on iOS 18.5) and their call blocking functionality is not working anymore.
All calls pass through and the phone rings on those "blocked" numbers. We got several user complaints about our app that is not working on iOS 26 Public Beta.
We've filed 2 bug reports with Feedback Assistant:
- FB19140680
- FB19140594
Please fix this issue in the next Beta versions of iOS 26 to have a stable iOS 26 release in the future. Thank you in advance.
I have also tested with a factory reset device (using the debugging profile) and still the call blocking didn't work. I have attached a sysdiagnose ZIP as well in the FB bug (sysdiagnose_2025.08.05_10-45-11+0300_iPhone-OS_iPhone_23A5297m.tar.gz)
Perfect, thank you. The set of logs taken with the debug profile were particularly helpful, and the team has found the issue, which was caused by an existing, subtle difference between how communicationd and callservicesd, which other changes in underlying infrastructure then exposed. I can't provide any specific timeline or scheduling, but the bug fix is straightforward and high priority.
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Kevin Elliott
DTS Engineer, CoreOS/Hardware
