Teletype (TTY) in Xiaomi Redmi 10: what is this feature and how to use it

Have you ever noticed a mysterious Teletype (or TTY) item in the Xiaomi Redmi 10 settings and wondered why it was needed? It's hidden deep in the feature menu, and most users don't even know it exists. Meanwhile, teletype is not just an archaic relic of the past, but a useful tool for people with hearing or speech impairments.

In this article, we will go into detail about what a teletype in a phone is, how it works on Redmi 10 (and other Xiaomi models), when it can be useful for a regular user, and why it is better not to activate it without having to. You will also learn how to turn on or off TTY, what modes it supports, and what pitfalls these settings are, if you encounter problems after activating the teletype, here you will find solutions.

What is a Teletype (TTY) and why you need it in a smartphone

Teletypewriter (TTY) is a text-based technology originally developed to send messages over phone lines in the form of printed text. In the age of analog phones, it was indispensable for deaf or hard of hearing people, allowing them to communicate through special devices called teletype machines. Today, this feature is integrated into modern smartphones, including the Xiaomi Redmi 10, but its purpose has remained the same.

In the context of a mobile phone TTY-regimen:

• 📞 Convert voice calls to real-time text messages (for people with hearing impairments).
• 🗣️ Transmit text messages as a voice (for people with speech impairments).
• 🔄 Use specialty TTY-devices connected to a smartphone via Bluetooth or cable.

It is important to understand that teletype in Redmi 10 is not a regular chat or SMS. It is a protocol that runs on top of voice calls, requires operator support and compatible equipment from the interlocutor. In Russia and CIS countries, this technology is rarely used, but in the United States and Europe it remains relevant for people with disabilities.

How does the teletype on Xiaomi Redmi 10: technical details

On Xiaomi Redmi 10 (and other models with MIUI), teletype is implemented at the software level, but for full operation you need:

• 📶 Support TTY Mobile operators (not all operators provide this service).
• 🔌 Compatible TTY-device (if an external device is used).
• 📱 Activation of the function in the settings of the smartphone.

Technically. TTY-The way it works is:

1. When you call, the smartphone switches to text mode, blocking voice transmission.
2. The text typed on the keyboard is converted into audio signals (according to the Baudot or ASCII protocol).
3. The interviewer (if he also has TTY enabled) sees your text on his device.

Redmi 10 has 4 TTY modes available:

Important: on the Xiaomi Redmi 10, TTY Full mode can lock the microphone and speaker even after the feature is turned off - a phone restart is required.

Where to find and how to turn on the Xiaomi Redmi 10

To activate or disable TTY-Redmi 10 mode, follow the instructions:

1. Open Settings (the gear icon on the main screen).
2. Go to Special Features (or Additional Settings → Special Features in some versions of MIUI).
3. Select the item "Hearing" (or "Speech and Text").
4. Tap it on Teletype (TTY).
5. Select the desired mode from the list (Off, Full, HCO or VCO).

After activation, a TTY icon will appear next to the network indicator, and when calling, the phone will use a text protocol.

Make sure your operator supports you. TTY|Check the compatibility of the interlocutor’s device|Keep important contacts in the TTY-Some functions may not work.|Prepare the exterior. TTY-device (if necessary)-->

If after switching on the teletype, the sound in the calls has disappeared or the microphone does not work, follow the following steps:

⚠️ Attention: Regime TTY Full can conflict with VoLTE and VoWiFi. If after activation of the teletype voice calls stopped working through the 4G/5G, turn off TTY Or reset your network settings in Settings. → SIM-maps and mobile networks → Resetting settings.

Teletype problems on Xiaomi Redmi 10 and their solutions

Despite its usefulness, TTY can cause phone malfunctions, and here are the most common problems and ways to fix them:

• 🔇 Missing sound in bells: Turn off TTY If the sound doesn't come back, check if Do Not Disturb or Quiet mode is activated.
• 📵 Mobile data is not working: some operators block data transmission to the Internet TTY-Try to switch to the mode. 3G or turn it off. TTY.
• 🔄 Calls reset: This may be due to conflict with VoLTE. turn off calls via 4G In Settings → SIM-maps and mobile networks → Challenges through 4G (VoLTE).
• 📱 Phone overheats: TTY-The mode increases the load on the processor. If you notice overheating, turn off the function.

If problems persist after disabling the teletype, reset the network settings:

Settings → SIM-maps and mobile networks → Reset settings → Reset settings

When to use a teletype and when not

The TTY feature on Xiaomi Redmi 10 is designed for a narrow range of tasks, and here are some cases when it should be activated:

• 🦻 You or your partner have hearing or speech impairments and use TTY-device.
• 🏥 You need to contact the support team that works with you. TTY (For example, some hotlines in the United States).
• 📡 You are testing hardware compatibility (for example, to set up a smart home with voice assistants).

Here’s when you should not turn on the teletype:

• ❌ You just want to try the “for interest” feature – it can disrupt calls.
• ❌ You don't. TTY-supportive device TTY — text will not be transmitted.
• ❌ You use VoLTE or VoWiFi – there may be conflicts.

💡

TTY is not a replacement for SMS or messengers; it only works during voice calls and requires support on both sides. For normal texting, use standard apps.

Alternatives to Teletype on Xiaomi Redmi 10

If you need a text communication but TTY is not suitable (or is causing crashes), consider alternatives:

💡

If you need text communication for business or customer support, consider services like LiveChat or Zendesk, which support live chat without being tied to phone calls.

Security and privacy when using TTY

Using a teletype on Xiaomi Redmi 10 has its own security nuances:

• 🔒 Data interception: TTY-Messages are transmitted over the telephone network and can be intercepted (unlike encrypted messengers).
• 📡 Localization: In some countries TTY-Traffic can be tracked by operators.
• 📱 Vulnerabilities MIUI: In older versions of the firmware were bugs that allow attackers to activate TTY Remotely (corrected in updates after) MIUI 12).

To minimize the risks:

1. Use TTY only with trusted interlocutors.
2. Update MIUI to the latest version (check Settings → About Phone → System Update).
3. Turn off TTY after use if it is not needed continuously.

⚠️ In 2023, security researchers discovered a vulnerability in the implementation of the TTY On some Xiaomi devices, allowing the caller to activate text mode without the subscriber's knowledge. MIUI 13.0.4 and later. Make sure your Redmi 10 is updated!

FAQ: Frequent questions about teletype on Xiaomi Redmi 10