Xiaomi Internet Works on WiFi But Not Mobile Data

Quick Answer:
If your Xiaomi connects to WiFi fine but has no internet on mobile data, first check Settings → SIM cards & mobile networks → [Your UK carrier] SIM → Mobile data is ON. Then go to Access Point Names (APN) and ensure the correct APN for your carrier is selected. Toggle Airplane mode on/off for 30 seconds. If still not working, reset APN to default or reset network settings.

How to Fix Xiaomi Mobile Data Not Working – 5 Quick Steps

  1. Check Mobile Data is ON – Settings → SIM cards & mobile networks → [Carrier] SIM → Mobile data toggle
  2. Toggle Airplane mode – ON for 30 seconds, then OFF
  3. Check APN settings – Settings → SIM cards & mobile networks → [Carrier] SIM → Access Point Names → Select correct APN
  4. Test SIM in another phone – Removes phone vs carrier confusion
  5. Reset network settings – Settings → Connection & sharing → Reset Wi-Fi, mobile networks, and Bluetooth

Why This Happens – Mobile Data Not Working

Most mobile data failures on Xiaomi are caused by APN, SIM, or carrier issues. When your phone has working WiFi but no mobile data, the most common causes are:

  • APN (Access Point Name) misconfiguration – Your phone connects to the mobile network but doesn't know how to route data.
  • Data limit or data saver enabled – Data saver or a set data limit can block mobile data while leaving WiFi untouched.
  • Carrier provisioning issue – Your carrier may have a problem with your data allowance, APN on their side, or account status.
  • SIM card issue – A faulty, dirty, or old SIM can connect to the network but fail to negotiate a data session.

Does Your Xiaomi Show 4G or 5G but No Internet?

If your phone shows 4G, LTE, or 5G signal bars but websites and apps won't load, the issue is usually APN configuration, carrier provisioning, or a temporary network outage. Signal bars only indicate network attachment, not successful internet access. This is one of the most common search queries – "connected but no internet" – and the fix is almost always APN-related.

Check if Mobile Data Works in Another Phone (Critical Test)

This is the most important diagnostic step. It tells you whether the problem is your Xiaomi or your SIM/carrier.

Step 1 – Remove your SIM card from your Xiaomi

Step 2 – Insert it into another phone (friend or family member's phone)

Step 3 – Test mobile data on that phone

  • If data works on the other phone: The problem is your Xiaomi (settings or software). Continue with the fixes below.
  • If data fails on the other phone too: The problem is your SIM card or carrier account. Request a replacement SIM from your carrier or check your data allowance.

Check Your Carrier's Correct APN Settings

Important: Mobile carriers sometimes update their APN settings. Always compare your APN with the latest values published on your carrier's official website.

EE UK

  • APN: everywhere
  • Username: (blank)
  • Password: (blank)
  • Authentication type: PAP

O2 UK

  • APN: mobile.o2.co.uk
  • Username: web
  • Password: web
  • Authentication type: PAP or CHAP

Vodafone UK

  • APN: internet
  • Username: web
  • Password: web
  • Authentication type: PAP or CHAP

Three UK

  • APN: three.co.uk
  • Username: (blank)
  • Password: (blank)
  • Authentication type: PAP

Giffgaff (O2 network)

  • APN: giffgaff.com
  • Username: (blank)
  • Password: (blank)
  • Authentication type: PAP or None

SMARTY (Three network)

  • APN: three.co.uk
  • Username: (blank)
  • Password: (blank)
  • Authentication type: PAP

Fix 1 – Check Mobile Data Toggle and Data Limit

Sometimes the simplest setting gets overlooked.

Check Mobile Data is ON: Settings → SIM cards & mobile networks → [Your carrier] SIM → Mobile data toggle → ON

Check Data limit: Settings → SIM cards & mobile networks → [Carrier] SIM → Data usage → Set data limit → Ensure not reached or disabled

Check Data saver: Settings → SIM cards & mobile networks → [Carrier] SIM → Data saver → OFF (or set apps to unrestricted)

Fix 2 – Toggle Airplane Mode (Quick Refresh)

This forces your phone to re-establish the mobile data session. Always try this before diving into APN settings.

Step 1 – Enable Airplane mode (swipe down notification shade or Settings → Connection & sharing)

Step 2 – Wait 30 seconds

Step 3 – Disable Airplane mode

Step 4 – Wait 60 seconds for data to reconnect

Fix 3 – Verify and Reset APN Settings

APN issues are the #1 cause of "mobile data not working" on Xiaomi.

Step 1 – Check current APN: Settings → SIM cards & mobile networks → [Carrier] SIM → Access Point Names → See which APN is selected

Step 2 – Compare with correct APN from the list above

Step 3 – If incorrect: Tap the APN → edit fields → Save → Select this APN

Step 4 – If APN list is empty or all incorrect: Tap three dots menu → Reset to default → Restart phone → Check again

Step 5 – If still no APN: Tap "New APN" or "+" → Enter the correct values → Save → Select it

Fix 4 – Check Carrier Provisioning (Data Allowance)

Your carrier may have blocked your data due to exceeded allowance, unpaid bill, or account issue.

Check your allowance in your carrier's mobile app:

  • EE: EE app or My EE account
  • O2: My O2 app
  • Vodafone: My Vodafone app
  • Three: Three app
  • Giffgaff: Giffgaff app – check Goodybag balance
  • SMARTY: SMARTY app

If you have exceeded your allowance, you need to add more data or wait for next billing cycle. No phone setting will fix this.

Fix 5 – Check Network Mode (4G/5G vs 3G Only)

If your phone is stuck on 3G/2G only, mobile data will be slow or non-existent.

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

Fix 6 – SIM Card Check and Clean

A dirty or poorly seated SIM can connect to the network but fail data sessions.

Step 1 – Power off your Xiaomi

Step 2 – Remove SIM tray and take out the SIM

Step 3 – Clean gold contacts with a soft, dry cloth

Step 4 – Reinsert SIM firmly and power on

Fix 7 – Reset Network Settings (Last Resort)

If mobile data still doesn't work after all above fixes, reset all network settings.

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

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

After reset: Restart phone → Go to Settings → SIM cards & mobile networks → [Carrier] SIM → Access Point Names → Reset to default → Select correct APN → Test mobile data.

Contact Your Carrier – When Required

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

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

Request them to check:

  • Data is enabled on your account
  • APN settings on their side are correct
  • Your data allowance hasn't been exceeded
  • Send a new SIM profile (over-the-air refresh)

Frequently Asked Questions

Why does my Xiaomi have WiFi but no mobile data?

Most commonly APN settings are incorrect. Go to Settings → SIM cards & mobile networks → [Carrier] SIM → Access Point Names → ensure the correct APN for your UK carrier is selected.

What does "connected but no internet" mean on Xiaomi mobile data?

It means your phone is attached to the mobile network (showing 4G/5G bars) but cannot route internet traffic. The fix is almost always APN-related. Check your APN settings first.

What is the correct APN for EE on Xiaomi?

EE uses APN: everywhere with username and password blank. Always check EE's official website for any updates.

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

Test your SIM in another phone. If mobile data works there, the problem is your Xiaomi. If it fails there too, the problem is your SIM or carrier account.

Does resetting network settings delete my photos?

No. Reset network settings only removes saved Wi-Fi passwords and paired Bluetooth devices. It does not delete photos, contacts, or any personal data.

Why is my mobile data not working after an update?

Updates can sometimes reset APN or carrier settings. Check your APN first, then toggle Airplane mode. If still not working, reset network settings.

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