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Xiaomi mobile data not working? What to check (HyperOS 3)

7 fixes, 7 with a real screenshot from our Redmi Note 15 Pro 5G on HyperOS 3.0.308.0. Try them in order.

By · Updated 31 Oct 2026 · 4 min read · Publisher: Saadat Rafiq

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Quick answer

Check the Mobile data tile in Control Centre, then Settings, Mobile networks, Mobile data. Open the SIM and check Access point names, and check Data roaming if you are abroad. Settings search, Data usage, shows which apps used data.

Step-by-step guide

Follow these steps in order. After each step, check if it works.

0 of 7 steps
  1. 1

    Check Control Centre

    Swipe down from the top right. The Mobile data tile should say On.

    Android screenshot: Check Control Centre
  2. 2

    Check Mobile networks

    Go to Settings, Mobile networks. Mobile data should be on. Our SIM is in slot 1.

    Android screenshot: Check Mobile networks
  3. 3

    Check Data roaming abroad

    Data roaming, on the same page, connects to data services when roaming. It needs to be on abroad.

    Android screenshot: Check Data roaming abroad
  4. 4

    Open the SIM's settings

    Tap the SIM at the top. Tap Access point names.

    Android screenshot: Open the SIM's settings
  5. 5

    Check the APN

    The APN list should show your carrier's entry; ours had one under General. New APN and Reset are at the bottom; we did not change anything here.

    Android screenshot: Check the APN
  6. 6

    Open Data usage

    Search Settings for Data usage. Ours first asked to Send app and network usage and diagnostic data. You can tap Disagree; we did.

    Android screenshot: Open Data usage
  7. 7

    See which apps use data

    The list shows each app's mobile data for today. Ours read 0 B, as we were on Wi-Fi.

    Android screenshot: See which apps use data

If you do not see this option

  • Only one SIM slot listed as No SIM card? That is slot 2 when you have one SIM. Turn on eSIM, on the same page, says eSIM will replace SIM 2.
  • Two SIMs? Xiaomi says to choose the data SIM in Mobile networks. Source: Generic User Guide for HyperOS 3.0

If this does not work

  • Data off after a restart? Check both switches again: the Control Centre tile and Mobile data in Settings.
  • Still no data? Reset Wi-Fi, mobile networks and Bluetooth resets network settings: Wi-Fi keeps disconnecting.
  • No 4G or 5G letters by the signal bars? Google says the data indicator may not show while Wi-Fi is connected, so turn Wi-Fi off and look again. If there is still no indicator, you may have no coverage there; move or go outside and check again.
  • Data stuck after travel or a tunnel? Turn Aeroplane mode on, wait 10 seconds and turn it off. Google suggests this before contacting your carrier.
  • Only one app has no data? Xiaomi's guide says Data usage in the Security app can restrict mobile data, background data or Wi-Fi for individual apps. Check that app has not been blocked. See stop an app using mobile data or Wi-Fi.

Good to know

4G calls and 5G: how to turn on VoLTE and 5G on a Xiaomi phone.

Turning Mobile data and Aeroplane mode off and on, and checking the APN or roaming, are all reversible. Resetting network settings is different: saved Wi-Fi networks and Bluetooth pairings may need setting up again.

When data works again, keep an eye on Data usage for a day. A sudden jump from one app can point to a background update or video autoplay. If problems keep coming back in the same place, Google's advice is to contact your mobile service provider, who can check coverage and your line.

About this guide

Device
Android
Shown on
Xiaomi Redmi Note 15 Pro 5G (25080RABDG), HyperOS 3.0.308.0, Android 16
Starts in
Quick Settings
Real screenshots
7 of 7 steps
Checked
October 2026
Sources
2 official, linked below

Sources

Links checked October 2026. Menus and features can change with updates.

Related guides

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Spotted a mistake? Menus change with updates, and we want every step to match your screen. Email us about this page or use the contact form. We read every report, and fixes are listed on What changed.

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