The feature is enabled in your iPhonesaccessibility tweaks.

Heres how to turn off RTT on an iPhone:

OpenSettings.

Scroll down, and tapAccessibility.

iPhone with Settings, Accessibility, and RTT highlighted

Scroll down, and tapRTT/TTY.

Tap the SoftwareRTT/TTYtoggle to disable it.

If necessary, tap theHardware TTYtoggle to disable it as well.

iPhone settings with Software RTT and Hardware RTT toggles off

RTT and TTY are now disabled on your iPhone.

What Is RTT/TTY on iPhones?

Who Is RTT For?

Scroll down toGeneraland selectAccessibility Shortcut.

Tap thecheckmarknext to any accessibility shortcut to turn it off.

To enable an accessibility shortcut on iPhone, go toSettings>Accessibility.

Scroll down toGeneraland selectAccessibility Shortcut.

To turn off the zoom accessibility option, go toSettings>Accessibility>Zoom.

Tap the slider next toZoomto turn off the feature.