Good morning, I have an iPhone 7 Plus with the public beta (through Apple) installed, and the bottom microphone doesn't work for voice calls, speaker phone, voice recordings, or facetime. I can do a video with audio fine, so the back mic works. I called Apple support yesterday, and the guy there had me try "Hey Siri", which worked, and voice to text, which also works, so I'm not sure if that means that it's an issue with the hardware or the operating system? The guy on Apple support said that both the Siri interaction and voice to text use the bottom mic, so for them to have worked makes me think it's a software issue? I clean dust and junk from the bottom holes out with little disposable plastic tooth picks that have rubber teeth, so I hope that it's not anything to do with that? I did a factory restore yesterday, then a restore backup. The mic still isn't working, but I think that if it's an issue with the software, restoring the backup would put the issue back on. I'm going to try to downgrade to iOS 11.2.5 now. Has anyone had a similar issue?