No microphone or calls work after iOS 15.8.4 update

It's not always the iOS update's fault!  Many things can cause phone problems.  If you tell people you think it's an iOS update, it might make it harder to fix or find a solution for the real issue.

Remember, the right question often leads to the solution!

Was/Is your device Jailbroken? If that's the situation, please be informed that attributing the issues to iOS updates may not be accurate.

iOS updates aim to enhance user experience, boost security, and fix bugs rather than disrupt core features. The majority of the issues after updates might stem from underlying, unmentioned factors. Updates won't typically alter personal data but may refine settings or features. Backup before major updates for safety. Review Apple's update details and backup advice for a smooth process.

Kindly consider checking your settings and addressing any device issues before attributing the issue to external factors. This could be a pure coincidence that the iOS update affected the iPhone functions.

Before initiating a standard iOS update, it's advisable to create a backup. Have you completed this step? If yes, proceed with the restoration from the backup.

See what each update does: About iOS 18 Updates, About iOS 17 Updates, About iOS 16 Updates, About iOS 15 Updates, About iOS 14 Updates, About iOS 13 Updates, About iOS 12 Updates, and so on...

It surely is not iOS 15.8.4 because...

I conducted a thorough search of this forum using the term 'Cellular network after iOS' and uncovered numerous posts detailing similar issues across various iOS updates. This suggests that iOS updates may not consistently be the root cause. Below are a handful of examples extracted from over 6,000 search results:

• Re: iPhone 7 Microphone Issue after IOS 13.3 Update
• Microphone issues after IOS 15.7.5 update - iPhone 7 Plus
• iPhone 7 microphone issues after iOS 12 update
• Microphone issue on iphone 7 after IOS 11.3 update
• Microphones/sounds issues after iOS update 13
• Re: I cant even record my audio in voice memos and in camera. This mic problemhas started after i updated my ios 15.6.1...
• Microphone cuts out during calls on CarPlay about 1 in 3 times after updatingto iOS 18.5...
• My microphone misbehaves after ios 17 update on iphone 14 plus
• iOS 16.4.1 installed = Cellular Network Data Issues
• IOS 17.1.2 killed my cell service!?
• why is iPhone 6s has no cellular connection after ios 15 update?
• IOS 17.1.2 Update caused major cellular network problem
• Cellular network is not recognised after updating to IOS 16.
• Re: I don't have cellular service on my iPhone after iOS 15.7.9 update
• Loss of Cell Connectivity After IOS 16.3 Update- iPhone 13 Pro Max
• Cellular error no network available after iOS update 15.4
• Cellular Issue with IOS 14
• Re: No service (cellular network) after upgrade to 14.7.1

What Call? On an iPhone, you can make and receive various types of calls. Here are the different types:

1. These are standard voice calls made over the cellular network. They utilize your carrier's voice network to connect you with other phone numbers. Allow phone calls on your iPad, iPod touch, and Mac
2. FaceTime Audio allows you to make voice calls over Wi-Fi or cellular data using your internet connection. It provides higher audio quality compared to traditional cellular calls.
3. FaceTime Video enables you to have video calls with other FaceTime users. It uses the front or rear camera on your iPhone to transmit live video during the call. Use FaceTime with your iPhone or iPad - Apple Support (IN)
4. VoIP (Voice over Internet Protocol) calls use internet connectivity to make phone calls. Apps like Skype, WhatsApp, Viber, and Google Hangouts utilize this technology, allowing you to make voice and video calls over the Internet.
5. Some carriers support Wi-Fi calling, which allows you to make and receive calls over a Wi-Fi network instead of relying solely on cellular coverage. This can be useful in areas with weak cellular reception. Make a call with Wi-Fi Calling - Apple Support (IN)
6. The App Store offers numerous calling apps that utilize different technologies. These apps can provide additional features and options for making calls, such as international calling, call recording, and more.

It's important to note that the availability of certain call types may depend on your iPhone model, iOS version, and carrier.