Why isn't my voice to text working on my iPhone after recent update?

Please test each of the following features individually to determine if they resolve the issue:

1. Enable Voice Over, and check if the problem is fixed. If not, disable Voice Over.
2. Enable Spoken Content, and check if the problem is fixed. If not, disable Spoken Content.
3. Enable Dictation, and check if the problem is fixed.

With VoiceOver—a gesture-based screen reader—you can use iPhone even if you can't see the screen. VoiceOver gives audible descriptions of what's on your screen—from battery level, to who's calling, to which app your finger is on. You can also adjust the speaking rate and pitch to suit your needs.

Turn on and practice VoiceOver on iPhone - Apple Support (IN)

Go to Settings > Accessibility > Spoken Content. Adjust any of the following: Speak Selection: To hear text you selected, tap the Speak button. Speak Screen: To hear the entire screen, swipe down with two fingers from the top of the screen.

Hear iPhone speak the screen, selected text, and typing ...

On your device, go to Settings > Accessibility > Spoken Content > Typing Feedback. From here, you can turn on the following: Character feedback: Turn on Characters to have your device speak letters as you type.

Use Typing Feedback on your iPhone, iPad, or iPod touch

Turn on Dictation

Go to Settings > General > Keyboard. Turn on Enable Dictation.

Dictate text on iPhone - Apple Support (IN)

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...