I have seen many topics on the forum regarding changing the ATC voice on both iOS and Andriod alike. There has already been a topic for Android covering this, which can be found here.
This topic is a tutorial that has only been confirmed to work on iOS 10.2. If this works on any other version, please tell me in a reply!
First, go into your settings app and open General.
From here, continue into Accessibility
Now, tap on the Speech section.
You will now need to turn on Speak Selection.
Now, you are able to control the speed of your ATC voice, accents, languages, and even how the ATC pronounces words. For instance, instead of saying “nineteen twenty two” for 1922, you can make it say “one nine two two”.
If you ever want to change the voice back to default simply change the voice to English U.S Samantha, although if you changed the voice speed, you may need to fiddle with it a little.
If this works for you, please comment the device type so I can add it to the Comfirmed Devices List.
Confirmed Devices: (Remember, it’s only confirmed to work on iOS 10.2 with U.S English Voices)
iPad Pro 9.7’’
iPhone 7
iPhone 7+
iPad Mini 4
iPhone 6+
iPad 4
iPhone 6
iPhone SE
iPad Air 2
iPad Mini 2
Please Note
For whatever reason, this tutorial does not work on all versions, nor devices. I do not have a whole lot of free time to dive into the issue, but I assume it has something to do with both device type and iOS version. If anyone has free time and is willing to make improvements to this tutorial, please do and message me in a PM what needs to be changed or added.