Set Default SIM Card for Outgoing Calls
Every time you dial a number, your Xiaomi phone pops up a menu asking which SIM card to use for the call. If you only ever tap the same option anyway, that extra confirmation step just slows down dialing. A fixed default SIM removes the prompt for good.
Wi-Fi Assistant: Select Best Networks Automatically
If your Xiaomi phone keeps switching away from a weak Wi-Fi network without asking, Wi-Fi assistant is likely doing that for you. Once every nearby network drops in signal, it can also fall back to mobile data on its own, which can use up your data plan faster than expected. This automatic switching can also cause interruptions during video calls or downloads.
Set a Daily Mobile Data Usage Limit
A monthly data cap does not catch the one day you binge-watch or download something huge, and by the time the monthly warning fires the damage is done. On Xiaomi phones you can add a separate daily threshold so heavy usage gets flagged the same day it happens. You also decide whether MIUI just warns you or cuts mobile data automatically once the limit is hit.
Turn Bluetooth On or Off
If a Bluetooth headset, speaker, or car kit will not pair with your Xiaomi phone, Bluetooth is often still switched off or was never fully enabled after a restart. The Quick Settings toggle can also drift out of sync with the actual radio state, which leaves paired devices unable to reconnect until you check the setting directly.
App Location Permission Settings
If a Xiaomi app keeps showing the location icon even when you are not actively using it, its permission is probably set to allow access all the time. That drains battery and can expose more data than the app actually needs. You can review and change this setting for every installed app individually.
Save Location Info for Photos and Videos
Photos and videos from the Xiaomi camera arrive without any location tag, so sorting vacation shots by place later only works if you remember the trip yourself. That happens because the camera option for saving location info sits switched off out of the box. Turning it on lets the Camera app attach GPS coordinates to every photo and video you capture.
Turn Data Roaming On or Off
If your Xiaomi phone connects to a foreign network, no data moves until data roaming is switched on. Once active, you get internet access abroad, but your carrier may bill extra for it. Xiaomi does not offer a simple on/off toggle here - it gives you three distinct roaming states, and picking the wrong one either blocks data or leaves roaming running when you do not want it.
Add a Printer via IP Address or Wi-Fi Direct
If your printer does not show up automatically even though your phone and printer share the same Wi-Fi network, MIUI still lets you add it manually. This usually happens with older printers, devices on a different subnet, or printers that only support Wi-Fi Direct instead of standard network discovery. In that case you need to enter the printer's IP address yourself or switch on Wi-Fi Direct printing directly from the printing menu.
Turn Screen Cast On or Off
If your Xiaomi phone won't mirror to a TV or monitor, the built-in Cast feature might be turned off, or your phone and screen aren't on the same Wi-Fi network. Screen Cast behaves differently from many third-party mirroring apps, since playback usually stops the moment you turn off the display. That makes it easy to mistake a disabled toggle for a broken connection.
Limit Connected Hotspot Devices
By default, your Xiaomi phone lets an unlimited number of devices join your mobile hotspot at once. That can slow down your connection and makes it hard to track who is actually using your data. Setting a maximum device count gives you back control over who connects.
Connect to Wi-Fi Using a QR Code
Typing out a long Wi-Fi password on a Xiaomi phone gets tedious, especially with mixed case letters and symbols. If the network owner has a QR code ready, you can skip the password field entirely by scanning it with the built-in Wi-Fi scanner.
Turn Location Access On or Off
If maps, weather, or camera apps suddenly stop finding your position on a Xiaomi phone, the general location toggle in MIUI settings might be switched off. Turning it off blocks GPS for every app at once, even those you already granted permission to use your location. This differs from per-app location permissions, which stay untouched but simply can't function without the master switch.
Manually Add an APN
If mobile data drops out or MMS messages will not send on your Xiaomi phone, the access point name (APN) supplied by your carrier might be missing or wrong. This entry is normally created the first time you insert a SIM card, but a factory reset, a new SIM, or a carrier update can wipe it out. Without a correct APN, the phone shows full signal but cannot actually load data.
Auto-download Updates via Mobile Data
If your Xiaomi phone keeps pulling system updates in the background while you are off Wi-Fi, mobile data usage can climb fast without warning. MIUI treats update downloads as automatic once a new version is detected, and a separate toggle decides whether mobile data counts as an allowed source for that download. Switching it off limits update downloads to Wi-Fi only, which matters if you are on a limited plan.
Select Network Manually
When you travel abroad and your phone keeps hanging on a weak carrier, automatic network selection is usually the cause. MIUI picks a network by signal priority, not by actual reception quality, so calls drop and data stalls even though a stronger carrier is available nearby. Switching to manual selection lets you pick that carrier yourself instead of waiting for the phone to reconnect.
Turn Wi-Fi Auto Reconnect On or Off
If your Xiaomi phone keeps rejoining a Wi-Fi network you would rather avoid, or the connection drops every time you walk back into range, the Connect automatically option tied to that specific network is behind it. MIUI turns this behavior on by default for every network you have ever joined, and it stays active until you switch it off for that network individually. That is also why disabling it on one network never changes the behavior of the others.
Turn Portable Wi-Fi Hotspot On or Off
If other devices cannot get online through your Xiaomi phone, the portable hotspot might simply be switched off or still using a network name and password you do not remember. This feature turns your mobile data connection into a Wi-Fi network for laptops, tablets or other phones nearby. Once it is active, the tricky part is usually finding the right toggle again, since it sits inside a settings screen most people only visit once.
Turn a SIM Card On or Off
On a dual SIM Xiaomi phone, calls or texts sometimes keep arriving on a line you no longer want to use, or you want to silence one number without pulling the physical card out. MIUI lets you deactivate a SIM slot completely, which stops all calls, messages and mobile data on that line until you switch it back on.
Turn Data Usage On or Off for a SIM Card
If mobile data suddenly refuses to turn back on after your phone hit its limit, the culprit is usually the Data usage toggle inside the Security app. Xiaomi switches off the connection automatically once the set threshold is reached, and it stays off until you flip that switch again. The same setting also lets you disable mobile data manually before any limit is close.
Change Password for a Saved Wi-Fi Network
If your router password changed, your Xiaomi phone still tries to connect with the old one and just shows Saved, not connected. This is common after a router reset or a switch to a new internet provider. You do not need to forget the network and start over, the saved entry can be updated directly.
Turn Emergency Location Service (ELS) On or Off
If first responders cannot pinpoint your position during an emergency call or text, Emergency Location Service on your Xiaomi phone may be switched off. This feature sends your current GPS position automatically whenever you dial an emergency number, but it only works if the setting is active and your wireless carrier supports it. Some users disable it by accident while adjusting location permissions, which delays help in a real emergency.
Turn On or Off Bluetooth Tethering
If your laptop or tablet has no free USB port, sharing your Xiaomi phone's mobile data over a cable is not an option. Bluetooth tethering lets you pass the connection wirelessly, but it needs to be paired and switched on first, and many users miss the toggle because it sits inside the hotspot settings rather than the Bluetooth menu itself.
Turn Google Location History On or Off
If Google Maps keeps suggesting places based on where you have been, or your Timeline fills up with stops you never meant to save, Location History is still active in the background. On Xiaomi phones this tracking can run even when no Google app is currently open, which surprises a lot of users checking their data usage or battery drain.
Turn USB Tethering On or Off
When you plug your Xiaomi phone into a PC or laptop to share its mobile data, the computer often prompts you to pick a connection type instead of connecting automatically. This happens because USB tethering sits in a separate toggle from your regular USB file-transfer mode. Without switching it on first, the cable only charges the phone or transfers files instead of sharing the data connection.