Watch 11 + iPhone 17 - issues with watch connectivity via Vodafone

Incompatibilities between Apple watch 11 and Vodafone One Number service. I've been trying to help someone who created a Vodafone One Number connection with his new Apple Watch 11 and iPhone 17.

The watch connectivity seems to have created a problem with the iPhone, the person was not receiving calls on the iPhone. When the watch connection was removed, the iPhone problem was resolved and the person started to receive calls again.

Please investigate this issue, as it seems to a release of software issue (this also happened to the Apple Watch Ultra 2 in the beginning and resolved after Apple launched a new SW release).