RTT/TTY call issue between iPhone 13 users

Hi Luka V.

welcome to the Appole (user=to=user) Community!

Re: "RTT/TTY call issue between iPhone 13 users"

Am no expert in this area, yet your post to the community deserves some response:

If you haven't read and followed Apple support's article (link below) it may provide some helpful tips:

Set up and use RTT and TTY on iPhone - Apple Support

Eg: says:

" ... you can communicate by telephone using Teletype (TTY) or real-time text (RTT)—protocols that transmit text as you type and allow the recipient to read the message right away. RTT is a more advanced protocol that

transmits audio as you type text".

More info. from the article: "RTT and TTY aren’t supported by all carriers or in all countries or regions.

RTT and TTY functionality depends on your carrier and network environment."

Also: "How to: "Type text during an RTT or TTY call

1. When you accept or start an RTT or TTY call, tap Use RTT, then tap .
2. Enter your message in the text field.
3. If you turned on Send Immediately in Settings, your recipient sees each character as you type. Otherwise, tap to send the message.
4. To also transmit audio, tap in the top-right corner."

_________________________________________________________

If you already know and make use of the above, and still need help:

Wondering if both the iPhones in use have the newest iOS version installed, or if it may help if they do.

Eg: About iOS 18 Updates - Apple Support says: iOS 18.1.1 is the newest version and

"This update provides important security fixes and is recommended for all users".

NB: If you want to update, it is wise to first back-up the iPhone.

______________________

If more support with this accessibility feature is needed:

You may want to contact the experts on Apple's Accessibility Support Team:

See: How to contact Apple for accessibility support - Apple Support

or

Apple's Accessibility Support Website (info. / support / contact options)

(NB: You can "Get Support" (online chat / phone / email etc.) from the link at the bottom of their website:)

Accessibility Support - Official Apple Support

All the best :-)

Thank you kindly for posting the video, explaining your experience in trying to use RTT on iPhone. Sorry I do not have a solution to offer. Perhaps others who see your video may be able to suggest something. (BTW: with volume up I understood your voice, and the captions were a welcome addition.)

It is often those who depend upon, and use frequently an accessibility feature, who can contribute most to troubleshooting, or improving that feature.

If you wish, you could send feedback to Apple's accessibility team.

Their email address: accessibility@apple.com. 

Thank you kindly for your thoughtful reply, Luka V. Grateful you have shared how you will work towards a solution through looking for a carrier who supports RTT/TTY. Some countries may not have carriers who support RTT/TTY. (Seems USA and Canada were early supporters of this technology.) Sharing your experience here may help others who look for answers.