Should I turn off TTY mode for normal calls?

Yes. Leave TTY mode switched off when no TTY device is connected, otherwise regular voice calls can sound muted or distorted.

Can I switch TTY mode during an active call?

No. Set the mode before dialing or answering, since changing it mid-call can drop the connection to the relay service.

Where do I find TTY mode if Accessibility does not show it directly?

Follow Phone ➔ Menu ➔ Settings ➔ Accessibility and look for TTY mode in the list. Some carriers place it under a call-specific accessibility section instead of the general one.

Android

Android: Turn On/Off TTY Mode

If a relay service call drops audio or the display stays blank during a text-based call, TTY mode is likely switched off or set to the wrong option. This accessibility feature routes calls through a text telephone connection instead of standard voice audio, and a mismatched setting breaks the handoff between your phone and the relay service. Getting the mode right matters most for calls placed through a TTY device connected via micro USB.

Updated: 04.08.20265 min6 steps

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Android

Turn On/Off TTY Mode auf Android

TTY mode lets an Android phone communicate with a text telephone (TTY) or a relay service instead of relying only on voice audio. It is built for people with hearing or speech disabilities and works by routing call audio through a text-based connection, typically over a micro USB link to an external TTY device.

When TTY mode is off, the phone treats every call as a normal voice call. If a TTY device is connected but the mode is disabled or set to the wrong option, the relay service cannot read or send text properly, so the call may sound silent or the text output stays empty.

You manage this setting through the accessibility menu:

Tap on Phone ➔ Open the Menu ➔ Tap on Settings ➔ Tap on Accessibility ➔ Tap on TTY mode ➔ Turn on/off the TTY mode.

Inside this screen you can select TTY Full or another supported mode, depending on your carrier and device. TTY Full sends and receives text for the entire call, which is the standard choice when a physical TTY device is attached.

Leave TTY mode off for regular voice calls without a connected TTY device, since it changes how the phone processes call audio and can otherwise cause muted or distorted sound on standard calls.

Frequently asked questions

Check that TTY mode is turned on and set to the mode your device expects, usually TTY Full. If the connection uses micro USB, make sure the cable is fully seated before placing the call.

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Android: Turn On/Off TTY Mode

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