Teletype (TTY) in Xiaomi Redmi 10S: what it is, how to turn on and why you need it

What is a teletype in a smartphone and why it appears in the settings of Xiaomi Redmi 10S

Have you ever noticed a mysterious "TTY" item in your Redmi 10S settings and wondered why you needed it? It's hidden deep in the feature menu, and most users don't even know it exists. Meanwhile, teletype is not just a random option, but an important tool for people with hearing or speech disabilities.

In this article, we will discuss in detail what TTY mode in Xiaomi Redmi 10S, how it works at a technical level, when it can be useful to the average user (yes, this is not only for people with disabilities!), and why it should not be turned on “just like that.” You will also learn how to set up a teletype if you suddenly need it, and what nuances are there when using this feature on modern smartphones.

Let me warn you right away: despite the fact that Redmi 10S supports TTY, not all mobile operators in Russia and the CIS are working with this technology correctly.

Teletype (TTY): what are these simple words?

TTY (Text Telephone, or Teletypewriter) is a technology that allows text messages to be sent over a phone line in real time, originally designed for deaf and hard of hearing people so they can communicate on the phone without having to hear the voice of the other person.

Modern smartphones, including the Xiaomi Redmi 10S, have a software-based teletype: instead of a physical device (which connected to a phone line in the 80s and 90s), a special protocol is used to convert text into audio signals and back again. These signals are transmitted over a standard voice channel, but instead of speech, you see text on the screen.

It's important to understand that TTY is not an SMS or messenger, it's a separate protocol that runs directly over a cellular network, without an Internet connection, and both people must have TTY-enabled devices or applications.

• 📡 Analog TTY: The old standard, used with physical teletype machines, is almost non-existent in smartphones.
• 📱 Digital. TTY (Real-Time Text, RTT): The modern version, supported by Android and iOS, is the one you will find in Redmi. 10S.
• 🔄 Full/partial TTY: The working modes, which we will talk about below.

Why you need a teletype in Xiaomi Redmi 10S: 5 real scenarios

Many people mistakenly think that TTY is only for people with disabilities, and there are actually a few situations where it can be useful for ordinary users:

1. Weak network signal: If voice communication is constantly interrupted but text messages (not SMS!) are more stable, TTY could be an alternative for short messages.
2. Emergency calls: In some countries (e.g. the United States), 911 services support TTY for the deaf. In Russia, this is not common, but theoretically possible.
3. Noise communication, like in a construction site or in a workshop where hearing is poor, but text chat via TTY can work.
4. Network testing: Mobile operators sometimes use TTY to diagnose communication quality.
5. Retro enthusiasts. Yes, there are people who experiment with outdated technologies out of curiosity!

But there's a downside: if you turn on TTY unnecessarily, it can degrade the quality of voice communication, because part of the bandwidth will be occupied with text data, so you should use the mode only as a matter of fact.

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If you need text chat on the phone, but TTY doesn’t work well, try calling-enabled messaging apps (like WhatsApp or Telegram) that are more reliable and don’t require special settings.

How to enable and configure teletype on Xiaomi Redmi 10S: step-by-step instructions

To activate TTY on your Redmi 10S, follow this instruction. Note: the path to settings may vary slightly depending on the version of MIUI, but the overall logic is maintained.

Make sure that SIM-card TTY (check with the operator)

Check the signal level of the network (must be stable)

Close all background applications that use a microphone

Connect the headphones (recommended for better signal reception)-->

Steps to incorporation:

1. Open the settings on your Redmi 10S.
2. Go to the Special Features section (sometimes called Additional Settings → Special Features).
3. Find Rumor or TTY Mode (may be hidden in the Communication submenu).
4. Choose one of the modes: TTY Full – the entire call is in text format; TTY Partial – part of the call voice, part text; TTY Modern and modern software (recommended); TTY Hardware - for connecting external TTY-device (rarity).

Save settings and restart your phone (sometimes required to apply changes).

When you turn on the next call, you'll see the ability to type text instead of voice, and the interface will be minimal: the input field and the area to read the interlocutor's messages.

TTY Modes: Which to Choose and What’s the Difference

The Xiaomi Redmi 10S has several teletype options available, which are easy to confuse, but each is designed for its own purposes.

Important: in Russia, most operators do not support TTY Full and TTY Partial modes due to outdated infrastructure. If you need a text call, choose TTY Software (RTT).

If you are not sure which mode to choose, start with TTY Software. It is the most versatile and has fewer compatibility issues.

TTY issues on Xiaomi Redmi 10S: why it doesn’t work and how to fix it

Even if you set up TTY correctly, you can have problems. Here are the most common problems and solutions.

• 📵 No connection: check if your operator supports TTY. In Russia, this is more the exception than the rule. Try contacting the operator's support and check if the service is included on your number.
• 🔊 Poor text quality: If the characters are transmitted with errors, the weak signal of the network is to blame. Try to move to a place with better coverage or switch to the best network. 3G (Sometimes he's more stable. 4G for TTY).
• ⚙️ No point. TTY in settings: update MIUI In the old firmware, this function could have been hidden.
• 📱 The interviewee does not see the text: make sure that he also has it turned on. TTY If he's using an iPhone, ask him to turn on Settings. → Universal access → TTY.

⚠️ Attention: if you have turned on TTY, But if you don't use it, it can lead to a high battery consumption, because the phone is constantly monitoring the communication channel for text data, even if you're just talking. TTY, if he doesn't need it.

If you encounter a TTY error that is not supported, your carrier has blocked the function at the network level, leaving only two options:

1. Try another one. SIM-map (for example, from MegaFon, which in some regions supports the TTY).
2. Use alternative methods of text calls (messaging, Skype with subtitles, etc.).

TTY Alternatives: What to Use Instead of Teletype in 2026

To be honest, TTY is an outdated technology, and in 2026, there are more modern and reliable ways of texting that work on any smartphone, including the Xiaomi Redmi 10S:

• 💬 Messengers with voice calls and subtitles: WhatsApp, Telegram, Viber support voice transcription into text in real time.
• 📞 Video calls with subtitles: Google Meet and Zoom can recognize speech and show it as text.
• 📱 Specialized applications: e.g. Rogervision or InnoCaption (for people with hearing impairments).
• 🆘 Emergency text-enabled services: in some countries (e.g. USA, UK) you can send SMS Emergency services number (in Russia, this is not yet working).

The advantage of these alternatives is that they are carrier-free and work over the Internet, which is much more reliable than voice-channel TTY.

⚠️ Attention: If you are using TTY For emergency calls, check it with a regular person in advance. In a critical situation, it may turn out that the operator does not support this feature, and you will lose valuable time.

If you want a text call without the Internet, TTY is the only option, and in all other cases, it's better to use modern applications.

FAQ: answers to frequent questions about teletype in Xiaomi Redmi 10S