Redmi 9 FAQ
Overview
1．Q：What are the features of Redmi 9？
A：Redmi 9 has a AI quad camera， 6.53" Full HD + display，a 5020mAh (typ) high-capacity battery with a maximum support of 18W quick charging + type-c interface， quick charging at critical moments;wireless FM radio， can listen to news， music， storytelling without headphones;The hardware is equipped with Helio G80 processor and 12nm FinFET processor， and 19.5:9 ratio to bring a cinematic visual experience.
Appearance
1．Q：What are the features of Redmi 9 body，and what material does it use？
A：Redmi 9 uses a 6.53" LCD full screen;Screen glass material is the third Corning protection glass， the back of the body uses the integration of 3D four surface design， at the same time also much lighter than the metal shell of mobile phone back;For the phone color，we can choose the Carbon Grey，Sunset Purple，Ocean Green 3 kinds of color.
2．Q：Does Redmi 9 have touch button？
A：Redmi 9 has no touch button and uses a virtual button scheme.
Setting path: Additional setting >> Full screen display >> Buttons.
3．Q：Does Redmi 9 have a LED indicator？
A：Redmi 9 doesn’t have a LED indicator.
4．Q：What specification does Redmi 9 use?What headphone equipment can use?
A：Redmi 9 supports 3.5mm digital headphones
Note：Redmi 9 does not support adapter analog headphones.
5．Q: What are the features of Redmi 9's AI face unlock?
A: The face unlock of Redmi 9 can achieve fast and safe face unlock through high-precision intelligent matching through face detection， attitude estimation， quality assessment， feature extraction， face comparison， in vivo detection and other technologies.
Risk tip: Face recognition is less secure than graphic， digital and hybrid passwords， and the phone could be unlocked by photos， people with similar looks or objects with similar features.
6.Q: Do you need to wake up the Redmi 9 screen of face unlock?
A: The Redmi 9's face unlock needs to wake up the screen after use.It can be used with the function of lifting and awakening to realize the smooth experience of lifting and unlocking the phone.You can select Settings>> Display>>"wake up" function.
7.Q: Does Redmi 9 support self-replacement of rear cover?
A: The Redmi 9 adopts an integrated body design， and the rear cover and battery are not self-disassembly and replacement.
8.Q: Does Redmi 9 support waterproofing?
A: Doesn’t support waterproofing.Redmi 9 has P2i coating process technology.
Hardware related
1.Q: What processor does Redmi 9 use and what is its performance?
A: Redmi 9 is equipped with Media Tek Helio G80， advanced 12nm process ， the highest master frequency is 2.0 GHz， with MIUI 11 system-level customized optimization.
2.Q: What is the selfie effect of Redmi 9 front camera?
A: Redmi 9 uses a 13MP camera with AI portrait mode in the front and express their emotions in slow motion.
3. Q: How does the Redmi 9 rear camera?
A: The Redmi 9 rear cameras are set to 13MP+8MP+5MP+2MP quad camera， with AI scene detection function， which can detect multiple scenes before and after to create better images.
4. Q: What is AI scene detection?
A: Through the depth algorithm and learning of artificial intelligence， the camera can support a variety of application scenes in real time. According to the different shooting contents， the camera parameters will be automatically adjusted by artificial intelligence and the optimization scheme will be matched， so that the picture will have layers， the subject will be highlighted with details， and the color will look better.Currently Redmi 9 can detect multiple before and after scenes to create better images.
5.Q: Why doesn't Redmi 9 blur in preview when taking photos in portrait mode?
A: For the comprehensive consideration of power and performance， Redmi 9 will not render the blur effect in the preview state when taking photos in portrait mode. After the shooting， the photos taken in portrait mode will show the background blur effect.
6.Q: What scale screen does Redmi 9 use?
A: Redmi 9 uses a 19.5: 9 ratio screen (resolution 1080(H)*2340(V)).At present， most apps on the market can automatically recognize the size and resolution of the phone's screen， so that the full screen can be displayed on the screen of 19.5:9.A small number of software or play video may not be full screen， not full screen software can be in the full screen Settings can force full screen， no black edge.
Note: if the current frequently used App of the user shows abnormal display and screen proportion is out of balance， it can be suggested to use
The user submits feedback in the desktop >> system tools folder >> user feedback App， and the module selects more >> third party
Application >> to select the corresponding application name， and detailed description of the problem of the App name， we will contact as soon as possible
App developers make adaptation updates.
7.Q: What are the features of the Redmi 9 screen?Does it support sun screen， night screen， eye protection mode and color temperature adjustment?
A: Redmi 9 uses a 6.53-inch LCD eye-protection screen with a resolution of 1080(H)*2340(V) and A screen ratio of 19.5:9.Support for sunlight screen， noctilucent screen， eye protection mode and non-polar color temperature.
8.Q: What kind of SIM card can Redmi 9 use? Does it support external SD card?
A: Redmi 9 adopts Nano SIM card +Nano SIM card +Micro SD card slot design.
Note 1: It is not recommended that users cut the card by themselves， which may cause damage to the card holder， fail to recognize the card or SIM card can not be taken out， etc.
Note 2: it is recommended that users purchase Micro SD cards through regular channels.
9. Q: Does Redmi 9 support dual sim cards and dual standby?
A: Redmi 9 supports dual sim cards and dual standby (single pass). Dual sim cards do not distinguish between primary and secondary cards.
Note: Dual 4G SIM requires support from local carrier services and may not be available in all regions.
10.Q: What kind of network does Redmi 9 support?
A: Redmi 9 supports 4G/3G/2G networks.
11.Q: Does Redmi 9 support VoLTE?
A: Redmi 9 supports dual SIM VoLTE HD calling (HD voice and video calling);Use this feature to make the call faster， better call quality;It needs SIM card operator to support， and the region has VoLTE network signal coverage.
12.Q: What is the capacity of the Redmi 9 battery?
A: Redmi 9 battery capacity is 5020mAh large capacity.
* The actual situation may vary with usage scenarios and software versions.
13.Q: What data interface does Redmi 9 use?
A: Redmi 9 uses a Type-C USB reversible connector port， and the data transmission standard is USB 2.0.
14.Q: Does Redmi 9 support quick charging? What is the standard of the adapter?
A: Redmi 9 supports QC3.0. QC3.0 supports up to 18W.
16.Q: Does Redmi 9 support NFC (near field communication)?
A: Subject to sales channel parameter
17.Q: Does Redmi 9 support WiFi in 5GHz band?
A: Redmi 9 supports WiFi in 2.4Ghz and 5GHz band.
Note: Redmi 9 cannot open the phone hotspot while connecting to WiFi.
18.Q: Does Redmi 9 support 5G?
A: 5G is not supported.
19.Q: What is the bluetooth version of Redmi 9?
A: Redmi 9 uses bluetooth version BT5.0， and can connect to external devices such as bluetooth mouse and bluetooth keyboard.
20.Q: Does Redmi 9 support radio (FM) function?
A: Redmi 9 supports a wireless radio (FM) function. It can listen to radio without the headphone， and can listen to regular FM radio programs， It covers all frequencies from 87-108mhz.
21.Q: What standard does the Redmi 9 have?
A: Redmi 9 standard equipment includes: Redmi 9 / Power adapter / TPU case / 5V2A Charger / USB Type-C cable / SIM eject tool / Warranty card / User guide.
System related
1.Q: Which version of MIUI is the built-in system of Redmi 9? Which version is customized based on Android?
A: The first batch of Redmi 9 shipped with MIUI 11 stable version of the system， based on Android 10 in-depth customization.
2.Q: Does Redmi 9 have voice assistant?
A: Redmi 9 has Google voice assistant.
3.Q: Does Redmi 9 support high volume mode?
A: Redmi 9 supports the high-volume mode. After adjusting the call volume to full， press the volume + button upward to enable the high-volume mode.By optimizing the software with the underlying hardware， the volume of the receiver can be increased again.At the same time， Redmi 9 supports external amplifying volume， which greatly improves the external playback volume and sound quality of the phone.
4.Q: Does Redmi 9 support big MAC fonts?
A: Redmi 9 supports big MAC font， which makes reading large characters easier and more convenient for the elderly.
Open path: System Settings >> Display >> Font size >> select "big MAC".
5.Q: What is Dark Mode?
A: Redmi 9 supports dark mode.The interface of the system and some applications is mainly black， which can reduce the discomfort of using the phone at night.
Note 1: some screen display functions will be affected when the dark mode is turned on;At the same time， because some third-party apps have not adapted to the dark mode， there may be an abnormal situation on the display.If the relevant display is abnormal after opening， it will return to normal after closing the dark color mode. Users can also submit feedback through the user feedback App to help us better complete and optimize.
Note 2: turn on the cell phone Settings - display， turn on the "dark mode" switch to enable the dark mode.
Note 3: at present， the dark mode does not support automatic switching according to time and remaining power.
6.Q: Does Redmi 9 support split screen mode?
A: Redmi 9 supports split screen mode.
7.Q: Does Redmi 9 support minimalist mode?
A: Redmi 9 is not pre-installed with the "minimalist mode" function. If you need to use it， you can download and install the "minimalist desktop" App from the Mi App store to realize the minimalist mode function.
8.Q: Does Redmi 9 support full-screen gestures?
A: Redmi 9 supports full-screen gestures， which you can select directly at the first boot or switch in the full-screen options set by the system after entering the system.
9.Q: Does Redmi 9 support one-handed mode?
A: Redmi 9 supports one hand mode， open method: Setting >> More setting >> One hand mode， you can choose to use different sizes.
After opening， enter one-hand mode:
1. To enter the left hand one-hand mode， you need to quickly slide from the "desktop key" to the "left function key";
2. To enter the one-handed mode with your right hand， you need to quickly slide from the "desktop key" to the "right function key".
10.Q: Does Redmi 9 support double click to wake up?
A: Redmi 9 supports double click on the screen to wake up (the system is turned off by default)， which needs to be turned on manually.
Open double-click wake-up setting path: system setting >> Lock screen >> Lock screen settings>>Double tap screen to wake.
11.Q: How does Redmi 9 perform hardware detection?
A: There are two ways of hardware detection for Redmi 9:
Method 1: enter "*#*#64663#*#*" in the dial interface， or enter "*#*#6484#*#*".
Mode 2: in the Setting>>My device>>All parameters， click "kernel version" four times.
12.Q: Does Redmi 9 have Bootloader lock?
A: In order to improve the security of user data， ensure the reliability of phone search function， and prevent scalpers from batch swiping third-party ROM， which may lead to user information leakage or other system problems， Redmi 9 has added Bootloader lock.
13. Q: Does Redmi 9 support the Recovery mode to empty data?
A: Redmi 9 supports the Recovery mode to clear all data.Enter the Recovery mode: in the shutdown state， hold down the volume + power button， and release the power button until entering the Recovery mode after MILogo appears on the screen.
Does it help?