A limited number of iPhone 7 and 7 Plus models, running iOS 11.3 or later, have a major issue that disables the microphone during phone calls. According to a recent report from MacRumors, which acquired an internal document distributed to Apple Authorized Service Providers, some users may experience a grayed-out speaker button while making phone calls. This means users could face issues being heard during voice and video calls.

It’s worth noting that Apple hasn’t confirmed the issue publicly, but the publication has independently verified the authenticity of the document. In case you’re facing a similar issue on your device, you can schedule a service appointment at any Apple Authorized Service Provider near you.