Owners of the Xiaomi Redmi Note 8T sometimes encounter the unfamiliar term "teletype" (or TTY) in the phone's settings, a feature hidden deep in the menu, and its purpose is not always obvious. If you see the mention of a teletype in the "Special Features" or "Calls" section, but do not understand what it is for, this article will help you understand.
In fact, teletype (TTY) is a technology designed for people with hearing or speech impairments that allows real-time text messaging during a phone call. In Redmi Note 8T, this feature is software-based, but requires compatibility with a carrier and special equipment. Next, we'll detail how it works, who can use it, and how to turn it on or off.
It’s worth noting that teletype in modern smartphones is more of a legacy than a necessity, now being replaced by instant messengers, sign language video calls and other technologies. However, in some countries (such as the United States and Canada), TTY is still used in emergency services to communicate with people with disabilities. In Russia, this feature is less common, but its support at Xiaomi indicates a global brand orientation.
What is a Teletype (TTY) and why is it needed?
Teletype (TTY, Text Telephone or Teletypewriter) is a text communication system originally designed for deaf and hard of hearing people, which allows text messages to be sent over a phone line in real time. Unlike SMS, which is sent after typing, TTY works like a chat: you type in text, and the person sees it as soon as you type.
In Xiaomi Redmi Note 8T, teletype functionality is integrated at the Android level, but its support depends on:
- 📶 Service Providers – Not all providers provide services TTY.
- 📱 Hardware compatibility – external work may be required TTY-device.
- 🌍 Regional Standards – in some countries TTY Replaced with more modern solutions (for example, Real-Time Text (RTT)).
The main scenarios for using TTY in the Redmi Note 8T:
- 🆘 Emergency calls – 911 support in the US and Canada TTY deaf.
- 💬 Talk to subscribers who also have TTY — If both parties have enabled this function.
- 🏥 Communication with medical institutions – some clinics are equipped TTY-terminal.
It's important to understand that teletype is not a substitute for SMS or messengers, it's a specialized tool that only works when certain conditions are met. If you're not the target audience (people with hearing impairments/speech), you probably won't need this feature.
How to turn on the teletype on Xiaomi Redmi Note 8T?
If you still need to activate TTY, you can do this through the phone settings. Instructions are suitable for the Redmi Note 8T with the original MIUI 11/12/13 firmware (depending on the version of the shell, the path may vary slightly).
Step-by-step:
- Open the Settings app (cog icon).
- Go to the section "Special features" (or "Additional settings" → "Special features").
- Select "Hearing" (or "Sound and Vibration" in some versions of MIUI).
- Find the "Teletype (TTY)" item and tap it.
- Select one of the modes: TTY Off - disabled (default value); TTY Full - full mode (text instead of voice); TTY HCO - mode for people with hearing impairment (voice + text); TTY VCO - mode for people with speech impairment (text + voice of the interlocutor).
Save the changes and restart the phone (recommended for settings).
Check support TTY operator|Make sure the interviewer is using it too. TTY|Choose the right regimen (Full/HCO/VCO)|Restart the phone after switching on-->
⚠️ Attention: After activation TTY If you don't plan on using teletype all the time, you'd better turn it off after using it.
Teletype modes: which one to choose?
The Redmi Note 8T has three main TTY modes, each designed for different user categories.
| Regime. | Description | Who's right for? |
|---|---|---|
| TTY Full | All voices are text-based. All messages are text-based. | People with complete deafness or serious speech impairments. |
| TTY HCO | Hybrid mode: You hear the voice of the interlocutor, but respond with text. | Hearing-impaired users who can hear speech. |
| TTY VCO | Reverse hybrid mode: You speak with your voice but see text responses. | People with speech impairments but with preserved hearing. |
The choice of mode depends on your physical abilities and the ability of the interlocutor, for example, if you call a support service that is equipped with a special service. TTY-check with the operator what mode they support. TTY Full.
⚠️ Attention: If you have turned on TTY, But the person who's not supporting it, the call will either not take place or be distorted. TTY-message.
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If TTY calls stop working after activation, check if the operator blocks this function. In Russia, some mobile networks do not support TTY due to low demand.
Problems with teletype on Xiaomi Redmi Note 8T: what to do?
Despite the support for TTY in the Redmi Note 8T, users sometimes face challenges, and here are some of the most common problems and ways to solve them:
1. TTY is not enabled or stored
- 🔄 Restart your phone – sometimes settings are reset due to errors MIUI.
- 📱 Check the firmware version: in old builds MIUI (below 11) the function may not work smoothly.
- 🛠️ Reset network settings: Settings → SIM-maps and mobile networks → Resetting network settings.
2 Calls are interrupted or not passed
- 📡 Make sure that the operator supports TTY (The list of supported networks can be specified on the provider’s website).
- 🔊 Check if there is any conflict. TTY with other features (e.g. VoLTE or Wi-Fi Calling) Try disabling them.
- 📞 Try calling another number with support. TTY, to eliminate the problem on the side of the interlocutor.
3. the text is transmitted with delay or distortion
- 📶 Check the quality of the communication — TTY nuisance-sensitive.
- 🔧 Try a regime change. TTY (for example, from full to HCO).
- 📵 If the problem persists, it may be the fault of the software - try to update MIUI last-minute.
If neither of these methods worked, you should contact Xiaomi’s support team or the carrier, and in some cases, the problem may be due to the hardware limitations of the model.
What if TTY is needed urgently but not working?
Alternatives to Teletype in 2026
Although TTY is still supported in the Xiaomi Redmi Note 8T, there are more modern and convenient ways of texting for people with hearing/speech impairments.
1. Real-Time Text (RTT)
- 📱 Built into new versions of Android (starting with 9.0) and iOS.
- 🚀 It works faster. TTY, Supports emoji and formatting.
- 🌐 It is supported by many operators (including AT&T, Verizon, T-Mobile).
2. Signal-translation annexes
- 🎧 Rogervision – Translating speech into text in real time.
- 📹 SignAll – Sign Language Recognition and Voice Translation.
- 💬 Ava – group chats with subtitles for the deaf.
3. Subtitled video calls
- 📹 Zoom, Google Meet, Skype – support automatic speech decryption.
- 🆘 911 with video relay service – in some countries, emergency services accept video calls with an interpreter.
4.Messaging with support for emergency calls
- 💬 WhatsApp, Telegram – Allows you to send messages to support services.
- 🚨 Specialized applications (e.g. Emergency Chat for contacting police).
If you use the Redmi Note 8T and TTY regularly, consider switching to more modern solutions, which are easier to set up and do not require special equipment.
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In 2026, TTY is inferior in functionality to RTT and sign language applications, but remains relevant for communication with outdated systems (for example, in some government agencies).
Security and privacy when using TTY
Like any data technology, teletype has privacy risks.
1. Interception of text messages
- 🔍 TTY-messages are transmitted over the telephone line and can be intercepted using special equipment.
- 🔒 If you are discussing sensitive information, it is best to use encrypted messengers (such as Signal or Session).
2. False emergency calls
- ⚠️ In some countries, fraudsters are using TTY simulate emergency calls.
- 📞 If you got a call through TTY Ask for help, please check with official sources.
3. Compatibility with other functions
- 📡 TTY It may conflict with VoLTE or Wi-Fi Calling, which leads to data leakage.
- 🔧 If you don't use TTY, Better keep it off.
⚠️ Attention: Services in Russia TTY They are not common, and most operators do not guarantee the protection of transmitted text messages. If privacy is critical, give preference to modern encrypted communication channels.