Teletype mode (TTY) Xiaomi Redmi phone: deal with the function for hearing impaired

Have you ever noticed in the settings of your Xiaomi Redmi mysterious item "Teletype mode" (TTY) And they were wondering why they needed it, and it's a feature that appears on the call menus of many smartphones, but not everyone understands what it's about. TTY — It is a specialized tool for people with hearing impairments, allowing you to communicate on the phone via text messages in real time.

In this article, we will discuss in detail what is a teletype on Xiaomi Redmi, how it works on different models (from Redmi Note 10 to Redmi). 13C), When it might be useful for regular users, and why it sometimes activates spontaneously, you'll also learn how to turn it on or off correctly. TTY, If it interferes with the normal operation of the phone, and what to do if after activation the sound disappeared during calls.

Spoiler: 90% of the time, you won't need this feature, but accidentally turning it on can seriously ruin the phone experience, so let's figure out how to manage the teletype mode and avoid the typical problems.

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

TTY (Text Telephone is a technology developed in the 1960s to provide telephone services for people with hearing impairments, and in modern smartphones, including the Xiaomi Redmi line, this mode allows for the use of the phone:

📱 Convert the voice of the interlocutor into text on the phone screen
💬 Send text messages instead of speech during a call
🔄 Use specialty TTY-devices via Bluetooth or cable
🚀 Ensure communication accessibility for hearing-impaired users

In practice, it works like this: when you call in mode TTY, Your Redmi is not sending voice data, but text characters. The interlocutor at the other end of the line must have a compatible device (for example, a device that is not voice data, TTY-modem or smartphone with teletype mode enabled to receive and decode a message.

In Russia and the CIS, this technology is less commonly used than in the US or Europe, where it is legally required to support it, but Xiaomi includes the feature in all its smartphones to meet international accessibility standards. TTY implemented software without the need for additional equipment.

📊 Have you ever used a regime? TTY?

Yeah, regularly.

I tried it once.

I've never heard of him.

I accidentally turned it on and didn't realize it was

How the regime looks TTY Xiaomi Redmi: signs of activation

If the teletype mode is activated on your Xiaomi Redmi, you will notice the following changes:

Sign.	Description	Models where you meet
Icon TTY status-line	A small teletype icon appears next to the network indicator	All models with MIUI 12 and newer
Lack of sound when ringing	You call, but you can’t hear the beeps or the voices of the interlocutor.	More often on Redmi. 9/10/11 series
Text field instead of keyboard set	When you call, you open the interface for text input.	Redmi Note 8 Pro and Newer
The "Impossible to Challenge" error	The system blocks regular calls, requiring TTY-device	Early versions MIUI on the Redmi 7/8

The most common problem is that the sound was lost during calls after accidentally turning on TTY. Redmi users often confuse this mode with the “Data Only” function in the settings. SIM-If you find that the phone does not ring or play the voice of the interlocutor, first check the status of the teletype mode.

⚠️ Note: Some Xiaomi firmware (especially custom) mode TTY It can be a conflict with VoLTE, if after activation of the teletype, calls through the phone stopped working. 4G, try to turn off TTY or reset the network settings.

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

Teletype mode management on Xiaomi Redmi depends on the version MIUI Here's a generic manual that will work for most devices (from Redmi 5 to Redmi 13):

For models with MIUI 14+ (For example, the Redmi Note 12 Pro+) The path may be slightly different:

Launch the Phone app
Slip on the profile avatar in the upper right corner
Select Call Settings → Additionally.
Find the Special Opportunities or Accessibility section
Turn off the switch Mode. TTY

If there is no item on your menu TTY, But the sound problems persist when calling, check:

🔍 Settings SIM-maps: Settings → SIM-maps and mobile networks → [yours SIM] → Type of network (must stand "4G/3G/2G", not "Only data")
🔊 Do Not Disturb: Sometimes it blocks the sound of calls
📱 System Updates: On Older Versions MIUI TTY may not work properly

💡

If after the shutdown TTY The sound when calling has not recovered, try resetting the network settings: → SIM-maps and mobile networks → Reset mobile network settings. This will delete the stored access points. APN, Write them down in advance or ask the operator.

Common problems with TTY Xiaomi and their solutions

Despite the usefulness of the feature, the teletype mode often becomes a source of headache for owners of Xiaomi Redmi.

1. TTY spontaneously

Reason: Conflict with other special features or firmware error.

Decision:

🛠 Update. MIUI last-minute
🔄 Disable all functions in the Settings section → Special facilities other than necessary
📱 Reset your phone (not your data!)

2. Upon activation TTY missing the bells

Reason: Teletype mode by default disables voice transmission.

Solution: Turn it off completely. TTY (See the instructions above and restart the phone if the sound doesn't come back:

1. Check the physical speaker for damage


2. Make sure that the "In-Phone" mode is not activated (can block the external speaker)




3. Test the call through headphones

3. Can't make an outgoing call in mode TTY

The reason is that your operator does not support TTY-connection or special equipment is required.

Decision:

📞 Contact the operator and clarify support TTY
🔧 Try a different mode. TTY (Full, HCO, VCO)
📲 Install a specialized text communication app (e.g. RogerVoice)

⚠️ Note: Some Redmi models (especially those with MediaTek processors) TTY It may be in conflict with the dual function. SIM. If you have two. SIM-Cards and phone problems, try temporarily disabling the second card or changing slots.

TTY Different models of Xiaomi Redmi: features and differences

The implementation of the teletype mode may vary depending on the Xiaomi Redmi model and firmware version, and here are the key features for popular devices:

Model	MIUI version	Features TTY	Typical problems
Redmi Note 10/11/12	MIUI 12.5+	Full support for all regimes TTY (Full, HCO, VCO)	Conflict with VoLTE on some firmware
Redmi 9/9A/9C	MIUI 12	Simplified version without mode VCO	Unauthorized Incorporation After Updating
Redmi 8/8A	MIUI 11	TTY Only in Full mode, requires a reboot.	Sound is lost in 50% of activation cases
Redmi Note 8 Pro	MIUI 10-12	Support for external support TTY-devices OTG	Mistake "No service" TTY" when connecting equipment

On new models (Redmi) 13C, Redmi Note 13 Pro+) Xiaomi has improved integration TTY systemically:

🔄 Automatic switching between voice and text modes
📊 Usage statistics TTY in the settings of special opportunities
🔊 Improved compatibility with VoLTE and VoWiFi

Redmi Note 12 Turbo and newer mode TTY You can activate a voice command through Google Assistant by saying "Enable Teletype Mode." This feature is especially useful for users with disabilities.

Alternatives to the regime TTY for hearing impaired on Xiaomi

If you need text calling functions, but standard TTY Xiaomi Redmi is not stable, consider these alternatives:

Text-based applications: 📱 RogerVoice – Supports real-time speech-to-text translation 💬 Glide – video calls with subtitles 📞 InnoCaption – a specialised solution for the United States (requires) VPN)
Functions MIUI hearing-impaired: 🔔 Settings → Special facilities → Rumor → Sound amplification 📊 Settings → Sound. → Mono-audio (for users with one ear working) 💡 Settings → Notifications → Blinking flash for call alerts
Hardware solutions: 🎧 Headphones with bone conduction (for example, AfterShokz) 📱 External TTY-modems connected via Bluetooth or OTG

For owners of Xiaomi Redmi with MIUI 13+ You can use a hidden Live Transcribe feature to activate it:

Go to Settings → Special Opportunities
Choose the Rumor. → Transcribing conversations
Download the necessary language packages

⚠️ Note: When using third-party text calling apps (such as RogerVoice), turn off the standard mode TTY The simultaneous operation of two systems can cause failures in the connection.

Security and privacy when using TTY

Teletype mode, like any data transfer feature, has its own security risks, and this is what Xiaomi Redmi owners need to know:

Potential vulnerabilities:

🔓 Interception of text messages: TTY-messages are transmitted through the operator network and can be intercepted when data leakage from the provider
📡 Device localization: Active TTY-The mode can be used to determine your location through cell towers
🔄 Conflicts with VPN: Some of them TTY-bypass VPN-The tunnels revealing the real IP-address

How to defend yourself:

🔒 Use only the official TTY from Xiaomi or verified apps from Google Play
📱 Update your firmware regularly MIUI (New versions are correcting vulnerabilities TTY)
🔑 Turn it off. TTY, When it is not needed, it will reduce the risk of accidental data interception.
🛡 For confidential conversations, use end-to-end encryption messengers (Signal, WhatsApp)

On Redmi models with Snapdragon chip 8xx (Like Redmi. K50) implemented hardware protection TTY-Data via Qualcomm Secure Processing Unit. On low-end devices with MediaTek Helio processors (e.g. Redmi) 10A) The level of protection is lower, so be especially careful when transmitting sensitive information.

How to check if yours is protected TTY-traffic?

Enter the code ##4636### in the engineering menu, then go to "Phone Information "TTY Status" is listed as "Encrypted: Yes, your text calls are protected. MIUI 12+ This function is activated by default.

FAQ: Frequent questions about the teletype mode on Xiaomi Redmi

Can I use it? TTY For regular text messages instead of SMS?

No, regime. TTY It's designed for real-time text calls only. SMS messenger. TTY It only works when both people are in touch (like a voice call, but with text instead of voice).

Why After Updating MIUI missing TTY customized?

In the new versions MIUI (13+) setup TTY It can be moved to the Special Opportunities section. → Rumor: If there's no point at all, your operator may have disabled support. TTY level SIM-Try inserting the cards. SIM Another operator and check again.

Can I use TTY for international calls?

Technically yes, but two things must be considered: 1 The operator of the interlocutor must support the operator of the interlocutor. TTY; 2) Fees may be charged as voice roaming. For reliable international text communication, it is better to use specialized applications such as RogerVoice or Skype with subtitling function.

What regime? TTY select: Full, HCO or VCO?

Depending on your needs: Full: both parties use TTY-device HCO (Hearable: You hear the voice of the person you are talking to, but you respond with text. VCO (Visible: You speak in your voice but see text responses For most Redmi users, mode is appropriate HCO, If you want to hear the interviewer, but respond with text.

Is it true that TTY discharges the battery faster?

Yeah, but not much. TTY consume 5-10% More power than a regular voice call because the phone is constantly encoding/dekRedmi with a battery. 5000+ mAh (e.g. Redmi Note) 11) It's almost invisible on models with batteries. 4000 mAh (e.g. Redmi) 10) difference 15-20 minute.

💡

If you are not a member of the group of users with hearing impairments, the TTY It is better to keep your Xiaomi Redmi off, which will prevent accidental sound problems during calls and prolong battery life.