Teletype mode (TTY) on Xiaomi Redmi Note 8: why you need and how to manage it

Have you ever noticed a mysterious teletype mode (or TTY Mode) item in the Xiaomi Redmi Note 8 settings and wondered what it is? It's hidden deep in the menu, but it can dramatically change how your phone works, for good or for bad, for example, users sometimes accidentally activate it, then the sound disappears during calls or the microphone stops working, while others specifically look for this mode to communicate using text instead of voice.

In this article, we’ll take a look at the TTY mode on the Redmi Note 8, from its initial purpose to its turn-on/off instructions, and learn why it can interfere with normal calls, how it interacts with the mobile network, and what alternatives are available for people with hearing impairments, and if you’ve already experienced problems after activating TTY, you’ll find a solution here.

What is Teletype Mode (TTY) and Why You Need It

TTY (Text Telephone) is a special feature designed for people with hearing or speech impairments that allows you to communicate on the phone using text messages that are transmitted in real time via voice. Historically, TTY was used with physical teletype devices connected to a telephone line, but in modern smartphones (including the Xiaomi Redmi Note 8), this technology is integrated directly into the software.

How does this work in practice? Instead of talking into a microphone, you type text on a keyboard and your interlocutor (if he also has TTY on) sees it on his screen. The reverse process is similar: text comes to you as messages. It's important to understand that TTY does not replace SMS or messengers — it's a separate protocol that works on top of a voice call.

• 🔄 Bilateral communication: both parties must support TTY, Otherwise, the text won't reach.
• 📡 Uses voice channel: data transfers via the same network as regular calls (not over the Internet!).
• ⚡ Low speed: Due to the limitations of analog networks, text is transmitted more slowly than in instant messengers.
• 🛠️ Requires settings: on the Redmi Note 8 TTY defaulted.

Today, TTY is less commonly used than before because more convenient alternatives have emerged: sign language video calls, voice messaging apps, and specialty apps for people with disabilities. However, in some countries (such as the United States), mobile operators are legally required to support TTY, so the feature remains in the firmware of smartphones, including Xiaomi models.

How TTY Mode Affects Regular Calls on Redmi Note 8

If you accidentally turned on TTY Mode on your Redmi Note 8, you may have noticed strange symptoms:

• 🔇 No sound during calls (neither in the speaker nor in the headphones).
• 🎤 The microphone is not working, the interlocutor can not hear you.
• 📞 Calls are dropped seconds after reply.
• 📶 Poor quality of communication, even if the network signal is stable.

This is because TTY intercepts the voice channel to transmit text, the phone thinks you want to communicate through text, and turns off the audio streams, and no notifications about the mode on may appear on the screen, which is one of the main reasons why users can not understand why the sound is missing for a long time.

⚠️ Attention: If, after activation, TTY If you try to call a number that doesn't support this mode, the call can automatically end. It's not a phone breakage, it's a protocol feature.

Another trap: some calling apps (such as WhatsApp or Skype) may conflict with the Internet. TTY. In this case, the sound will disappear only in these applications, and standard calls through the Internet. SIM-The card will remain operational. To avoid confusion, check the settings. TTY at the first sign of communication problems.

Where is the TTY setting on Xiaomi Redmi Note 8

On the Redmi Note 8 (and other Xiaomi MIUI-based smartphones), the TTY setting is hidden in the special features menu.

1. Open the Settings app.
2. Go to Special Features (or Additional Settings → Special Features in some versions of MIUI).
3. Select the item Rumor.
4. Tap on Teletype Mode (TTY).

In this menu you will see several options:

• Refreshment: The mode is off (standard state).
• Full TTY – The text is transmitted in both directions.
• TTY HCO – Listening-only text (for people with speech impairments).
• TTY VCO – text only for sending (for people with hearing impairments).

If you are not using TTY to communicate, it is recommended to leave the value of Response.. Even if you turn on the mode accidentally, it can always be deactivated along the same path.

Make sure you don’t have active calls.

Remember the current mode (take a picture of the screen)

Check the balance. SIM-Cards (some operators are blocking) TTY negative-balance)

Restart your phone after changing your settings-->

Step-by-step: how to turn TTY on or off

If you need to activate TTY Mode for special needs or, conversely, return the phone to normal mode, follow this instruction. TTY (Complete, HCO, VCO).

TTY Incorporation

1. Open Settings → Special Features → Hearing → Teletype Mode (TTY).
2. Select the mode you want: Full TTY for two-way text communication; TTY HCO for hearing but not speaking; TTY VCO for speaking but not hearing.

Confirm the selection (the phone may request a reboot).

Check your work by making a test call to a number that supports TTY (e.g., a support service for people with disabilities).

Shutdown of TTY

1. Go to the same menu: Settings → Special features → Hearing → Teletype Mode (TTY).
2. Pick a Rec.
3. Restart your phone (required!) to make the changes effective.
4. Check the sound by making a regular call.

⚠️ Attention: If after the shutdown TTY The sound didn't come back, check: Is the mode on the plane activated, is the sound of the call turned off in the profile settings, is the microphone blocked by third-party applications (for example, a voice recorder or messenger).

If problems persist, try resetting your network settings:

→ SIM-maps and mobile networks → Network reset

💡

Before resetting your network, save important SMS and contacts – they can be deleted!

TTY issues on Redmi Note 8 and their solutions

Despite its simplicity, TTY Mode can cause a variety of failures, and here are the most common problems and ways to fix them:

If none of the solutions worked, check if there are any problems with the firmware update. Some versions of MIUI for the Redmi Note 8 have bugs that caused the TTY to malfunction.

Settings → About the phone → System update

TTY Alternatives for People with Hearing Impairments

If the TTY Mode on the Redmi Note 8 is unstable or your carrier does not support it, consider alternative ways to communicate:

• 📱 Signal Translation Apps: Ava translates speech into text in real time. Live Transcribe (from Google) recognizes speech and displays subtitles.
• 🎥 Sign language video calls: Skype with gesture interpreter support. Zoom with subtitles.
• 💬 Messengers with voice messages: WhatsApp (voices are converted to text). Telegram with bots-translators.
• 📞 Special Operator Services: Some operators (such as Beeline or MTS) have toll-free numbers for people with disabilities.

The advantage of these solutions is that they don't require special settings on the phone and work over the Internet, not through a voice channel. For example, Live Transcribe can recognize speech even offline, and Ava supports group chat with translation for multiple interlocutors.

⚠️ Note: Some sign language applications require access to microphone and contacts. → Annexes → Permits.

💡

TTY is inferior to modern alternatives in speed and convenience, but remains the only option for communication over analog networks (for example, in areas without Internet).

Frequent questions about TTY mode on Xiaomi Redmi Note 8