Xiaomi Mobile Data Stops After Installing HyperOS

Quick Answer:
If your Xiaomi had working mobile data before HyperOS update but stopped after, first toggle Airplane mode ON for 30 seconds, then OFF. If that doesn't work, go to Settings → SIM cards & mobile networks → [Your carrier] SIM → Access Point Names → tap three dots → Reset to default → Restart. In many cases, HyperOS updates reset APN settings. If still not working, check Data Saver is OFF in the same menu.

5 Quick Fixes – Start Here

  1. Toggle Airplane mode – ON for 30 seconds, then OFF. Wait 60 seconds.
  2. Reset APN to default – Settings → SIM cards & mobile networks → [Carrier] SIM → Access Point Names → three dots → Reset to default → Restart.
  3. Turn off Data Saver – Same menu → Data saver → OFF.
  4. Check your data allowance – Use your carrier's app (EE, O2, Vodafone, Three).
  5. Reset network settings – Settings → Connection & sharing → Reset Wi-Fi, mobile networks, and Bluetooth.

Why This Happens – 3 Main Causes

  • APN settings reset – In some cases, HyperOS updates may reset your APN (Access Point Name). Your phone connects to the network but doesn't know how to route data.
  • Data Saver re-enabled – The update can turn Data Saver back on, blocking mobile data for some or all apps.
  • Network mode changed – Your preferred network type may have been set to "5G only" or "3G only", causing connection loss.

Fix 1 – Toggle Airplane Mode (Quick Refresh)

This forces your phone to re-register on your carrier's network. Always try this first.

Step 1 – Enable Airplane mode (swipe down notification shade)

Step 2 – Wait 30 seconds

Step 3 – Disable Airplane mode

Step 4 – Wait 60 seconds – check if mobile data returns

Fix 2 – Reset APN to Default (Most Common Fix)

In many cases, HyperOS updates may reset or corrupt APN settings. This is the most common cause of "4G/5G icon but no internet" after an update.

Step 1 – Go to APN settings: Settings → SIM cards & mobile networks → [Your carrier] SIM → Access Point Names

Step 2 – Reset to default: Tap three dots menu (⋮) → Reset to default → OK

Step 3 – Restart your phone

Step 4 – Test mobile data

If still not working: Your carrier may need to send a new APN profile. Call them (see Contact section below).

Fix 3 – Turn Off Data Saver

HyperOS updates can re-enable Data Saver, blocking mobile data for many apps.

Navigation: Settings → SIM cards & mobile networks → [Your carrier] SIM → Data saver → OFF

Also check: Settings → Apps → Manage apps → Select an app (e.g., Chrome) → Data usage → Background data → Allow

Fix 4 – Check Network Mode

The update may have changed your preferred network type.

Navigation: Settings → SIM cards & mobile networks → [Your carrier] SIM → Preferred network type → Select 5G/4G/3G auto or 4G/3G/2G auto (not "5G only" or "3G only")

Fix 5 – Reset Network Settings (Last Resort)

⚠️ Removes saved Wi-Fi passwords and paired Bluetooth devices. Does not delete photos or contacts.

Path: Settings → Connection & sharing → Reset Wi-Fi, mobile networks, and Bluetooth

After reset: Restart phone → Re-enter Wi-Fi passwords → Test mobile data.

Only do this if Fixes 1-4 didn't work.

Test Your SIM in Another Phone

This tells you whether the problem is your Xiaomi or your carrier/SIM.

  • If data works on another phone: The problem is your Xiaomi. Reset network settings (Fix 5).
  • If data fails on another phone too: The problem is your SIM or carrier. Call your carrier.

What Does "4G/5G Icon But No Internet" Mean?

Signal bars only show network attachment – not successful data routing. You can have full bars but no internet if APN settings are wrong or Data Saver is on. This is very common after HyperOS updates.

Contact Your Carrier – When Required

Call your carrier if mobile data still doesn't work after all fixes:

  • EE: 150 or 0800 956 6000
  • O2: 202 or 0344 809 0202
  • Vodafone: 191 or 0333 304 0191
  • Three: 333 or 0333 338 1001

Request them to:

  • Check if data is enabled on your account
  • Send a new SIM profile (over-the-air refresh)
  • Replace your SIM if it's older than 3-4 years

Frequently Asked Questions

Why did my mobile data stop working after HyperOS update?

Most commonly APN settings were reset, or Data Saver was re-enabled. Reset APN to default and turn off Data Saver – these two fixes resolve most cases.

How do I reset APN on Xiaomi?

Settings → SIM cards & mobile networks → [Your carrier] SIM → Access Point Names → three dots menu → Reset to default → Restart.

Will resetting network settings delete my photos?

No. Only saved Wi-Fi passwords and Bluetooth devices are removed. Photos, contacts, and personal data are safe.

How do I know if the problem is my phone or my carrier?

Test your SIM in another phone. If data works there, your phone is the issue. If not, your carrier or SIM is the issue.

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