"Microphone modes are currently unavailable" is a proproblem for many users of iPhone which is trying to activate Voice Isolation or Wide Spectrum during voice calls.
Normally, all models of iPhone XS or later should support this voice filtering feature during phone calls with the release iOS 16.4.
Up to iOS 16.4, Voice Isolation si Wide Spectrum they were only available for calls FaceTime. Apple has extended this feature, but apparently, many users cannot enjoy it.
Fix iPhone Microphone modes are currently unavailable
Apple unfortunately does not offer a solution to solve this problemish Many users complain on the official forum of Apple that the error appears for every mode he tries to activate for the microphone. "Voice Isolation mode are currently unavailable"Or"Wide Spectrum mode are currently unavailable".
From what I tested on one iPhone 12 Pro, iPhone 13 Pro si iPhone 14 Pro, the solution is very simple. Start a call with someone and try to activate "Voice Isolation"Or"Wide Spectrum". If the function is not available, close the call, restart iPhone, then call again. In my case it worked on all models iPhone mentioned before.