I have iPhone 16I have the same problem with my iPhone 15PM updated to iOS18.1DB. I get the ding sound with Siri activation but no border animated illumination. However it works very well on my iPad Pro 6th gen, Siri is actually perfect on it. Don’t understand why it should work on IPP and not iPhone, both have identical setup in Settings. I tried Pearsey’s advice to hard reset, AI on/off, Siri on/off on the iPhone but no border lights on it. Does that mean the bug is in iOS and not in iPadOS?