Xiaomi Mobile Data Not Working on TDC Denmark

Xiaomi Mobile Data Not Working on TDC Denmark (2026 Fix)

📌 Quick Answer – If Your Xiaomi Mobile Data Isn't Working on TDC:

  • ✓ Check mobile data is enabled – Swipe down and ensure the Mobile Data icon is highlighted.
  • ✓ Check your data balance – You may have exceeded your monthly allowance. Check the Mit TDC app.
  • ✓ Check APN settings – TDC's official APN is internet.
  • ✓ Reset APN to default – Settings → SIM cards & mobile networks → Access Point Names → Reset to default.
  • ✓ Test your SIM in another phone – This is the quickest way to determine if the issue is your Xiaomi device or your SIM/account.
  • ✓ Try switching between 4G and 5G – Temporarily select 4G (LTE) preferred as a diagnostic test.

If data still doesn't work, follow the step-by-step guide below.

If your Xiaomi, Redmi, or POCO phone won't connect to the internet, shows "No Internet", or the 4G/5G icon is visible but data doesn't work on TDC Denmark, this guide covers common troubleshooting steps. This issue can occur anywhere in Denmark and may affect both 4G and 5G connections.

Before You Start – Quick Checks

  • Toggle Airplane Mode – Turn on for 30 seconds, then off to refresh your network connection.
  • Restart your phone – Clears temporary software glitches affecting mobile data.
  • Check your data balance – Depending on your plan, data may be cut off after exceeding your monthly allowance. Check the Mit TDC app.
  • Test at different times and locations – Network performance varies by time of day and area.
  • Check TDC network status – Visit TDC's network status page for any outages in your area.

If these quick checks don't work, continue with the step-by-step guide below.

Quick Navigation

Diagnose the Issue First

Before making changes, determine the pattern of your mobile data issue:

  • Is mobile data completely off or just slow? – Check if the 4G/5G icon appears in the status bar.
  • Does the 4G/5G icon show but there is no internet? – This usually means the phone is connected to the mobile network, but the data connection itself is failing. Checking APN settings is an important step.
  • Location-specific? – Does the problem occur everywhere or only in certain areas? Coverage can vary across Denmark.
  • Did it work before? – Did this issue start after a system update, SIM swap, or traveling abroad? If you're outside Denmark, make sure Data Roaming is enabled and that roaming is included in your plan.

Why This Happens

  • Incorrect APN settings – TDC Denmark requires specific APN settings. If the APN is misconfigured, mobile data may not work even though the phone shows signal. TDC's official APN is internet.
  • Network coverage – Weak signals or varying coverage can make the internet feel unstable or slow.
  • Account or plan limitations – You may have used up your data allowance, or your account may have a data block enabled.
  • Network mode mismatch – If your phone is locked to a specific network mode in an area without coverage, it may fail to connect.
  • VPN, Private DNS, or Data Saver – VPNs, custom DNS, or data saver features can sometimes block mobile data.
  • Software or configuration issues – Outdated system software or custom ROMs can sometimes cause mobile data problems.

Quick Diagnostic Table

  • No signal / no networks found → Coverage, radio/band compatibility, or hardware
  • Signal bars visible but no internet → APN/data configuration issue
  • Data works on other phones but not on Xiaomi → Device-specific APN/configuration issue
  • Data works on 4G but not 5G → 5G provisioning/compatibility
  • Data stops working after a system update → Software/configuration change

Check Network Status (TDC Denmark)

Before troubleshooting your device, verify TDC's network status:

  • Check TDC's network status page for coverage and any planned maintenance or outages in your area.
  • If TDC reports an outage affecting your area, wait until the network issue is resolved before continuing with device troubleshooting.

TDC Network Notes (Denmark)

  • Network operator: TDC A/S – the largest telecom provider in Denmark, serving approximately 5.9 million customers .
  • Common LTE bands: B3 (1800 MHz), B7 (2600 MHz), B20 (800 MHz).
  • APN for mobile data: internet .
  • MCC/MNC: 238 / 01 .
  • 5G coverage: TDC NET has led Denmark's rapid 5G deployment, now covering 99% of the country .

Step 1: Test SIM in Another Phone

Why this matters: This is the quickest way to determine if the issue is your Xiaomi device or your SIM/network.

  • Insert your TDC SIM into another phone
  • Check if mobile data works on the other phone in the same location
  • If data works normally on the other phone, the issue is more likely related to your Xiaomi device or its configuration – continue with the steps below
  • If data also doesn't work on the other phone, the problem is more likely related to your SIM, account, or the TDC network – contact TDC

If the SIM works normally in another phone, continue with Step 2.

Step 2: Test Another SIM in Your Xiaomi

Why this matters: This helps isolate whether the problem is with your Xiaomi device or with the TDC SIM/account.

  • Insert a working SIM from another carrier into your Xiaomi.
  • Check if mobile data works on the other SIM in the same location.
  • If another SIM works on your Xiaomi, the problem is more likely specific to the TDC SIM, TDC account/provisioning, or compatibility/configuration between the Xiaomi and TDC.
  • If another SIM also fails on your Xiaomi, the problem is more likely with your Xiaomi device itself.

If the SIM works normally in another phone, continue with Step 3.

What the SIM Tests Tell You

Interpreting the SIM Test Results

  • Your TDC SIM has no mobile data in multiple phones → Focus on the SIM, account, data plan, or carrier network.
  • Your TDC SIM works in another phone, but another working SIM also has no data in your Xiaomi → Focus on the Xiaomi device, network configuration, firmware, or hardware.
  • Your TDC SIM works in another phone and another SIM works in your Xiaomi → The issue is likely specific to the TDC SIM, account provisioning, APN configuration, or interaction between the SIM and device.
  • Only 5G fails while 4G works → The issue is likely related to 5G coverage, provisioning, or compatibility rather than general mobile data failure.

Step 3: Check Mobile Data is Enabled

Why this matters: Mobile data may have been accidentally disabled.

  • Swipe down from the top of the screen to open the notification panel
  • Check that the Mobile Data icon is highlighted
  • Alternatively: Settings → SIM cards & mobile networks → Tap your TDC SIM → Toggle Mobile data ON

Note: Menu names may vary slightly between HyperOS and MIUI versions.

If mobile data is enabled but still not working, move to Step 4.

Step 4: Check Preferred Network Type

Why this matters: As a diagnostic test, switching between 4G and 5G can help identify whether the issue relates to network mode compatibility.

  • Settings → SIM cards & mobile networks
  • Tap your TDC SIM
  • Tap Preferred network type
  • Temporarily select 4G (LTE) preferred as a test
  • Wait 30 seconds and check if mobile data works

Note: This is a diagnostic test. If mobile data works on 4G but not 5G, the problem may be related to 5G coverage or configuration. You can continue using 4G while troubleshooting 5G separately.

If data still doesn't work, move to Step 5.

Step 5: Check APN Settings

Why this matters: APN misconfiguration is a common cause of mobile data failure on TDC Denmark. This is particularly relevant if you see 4G/5G signal but cannot access the internet.

Standard TDC Denmark APN settings based on official documentation:

TDC Denmark APN Configuration

  • Name: TDC Internet (or any name you prefer)
  • APN: internet
  • Username: (leave blank)
  • Password: (leave blank)
  • MMSC: http://mmsc.tdc.dk:8002
  • MMS Proxy: inetproxy.tdc.dk:8080
  • MCC: 238
  • MNC: 01
  • Authentication Type: Leave default
  • APN Type: default,supl (or default,ia,supl depending on the device)
  • APN Protocol: IPv4/IPv6

Note on MMS: If you need to send or receive MMS messages, you may need a separate MMS APN with APN type mms .

  1. Settings → SIM cards & mobile networks
  2. Tap your TDC SIM
  3. Tap Access Point Names (APN)
  4. Tap the menu icon (three dots) and select Reset to default
  5. If that doesn't work, manually create a new APN with the settings above
  6. Restart your phone and check if data works

If APN settings are correct but data still doesn't work, move to Step 6.

Step 6: Check for VPN, Private DNS, or Data Saver

Why this matters: VPNs, custom DNS, or data saver features can sometimes block mobile data.

  • Disable any active VPN – If you use a VPN, disconnect it temporarily.
  • Check Private DNS – Go to Settings → More connectivity options → Private DNS (menu names may vary). Set Private DNS to Automatic temporarily.
  • Check Data Saver – Go to Settings → Connections & sharing → Data usage and toggle off Data Saver if enabled.
  • Test mobile data again.

If data still doesn't work, move to Step 7.

Step 7: Reset Network Settings

Why this matters: This resets Wi-Fi, mobile data, and Bluetooth settings without deleting personal data. It clears corrupted network configurations that may be preventing mobile data.

  1. Settings → Connection & sharing (HyperOS) or Settings → Additional settings → Backup & reset (MIUI)
  2. Select Reset Wi-Fi, mobile & Bluetooth or Reset network settings
  3. Confirm the reset
  4. Restart your phone
  5. Wait a few minutes for the phone to reconnect to the network
  6. Check if data works

If data still doesn't work, move to Step 8.

Step 8: Check for System Updates

Why this matters: Software updates often include modem firmware and carrier configuration improvements that can restore mobile data connectivity.

  1. Settings → About phone → Check for updates
  2. Install any available updates
  3. Restart your phone and check if data works

Note: If mobile data stopped working immediately after a system update, check whether a newer update is available. A carrier configuration or modem software change can sometimes affect network connectivity .

If you're already on the latest version and data still doesn't work, contact TDC or Xiaomi support.

Decision Box – What to Do Next?

Still not working? Let's narrow it down:

  • ✓ TDC SIM works for data in another phone, but other SIMs work in your Xiaomi? → The problem is specific to the TDC SIM/account, APN, or carrier provisioning.
  • ✓ Your TDC SIM works for calls and SMS but not mobile data? → Check data allowance, account restrictions, APN, and data provisioning.
  • ✓ No SIM can use mobile data in your Xiaomi? → Focus on Xiaomi network settings, firmware, or device hardware.
  • ✓ 4G/5G icon visible but no internet? → Check APN settings (Step 5) – this is a common cause.
  • ✓ Data works on other networks but not TDC? → Focus on TDC SIM, subscription provisioning, APN configuration, and TDC-specific network settings.
  • ✓ Only 5G fails but 4G works? → Problem may be related to 5G coverage or configuration.
  • ✓ Nothing works? → Contact TDC to check your account status, data plan limits, and local network conditions.

Contact Carrier (When Required)

Contact TDC Denmark if:

  • Your SIM has no data in other phones as well (network or account issue).
  • You've tried all steps above and data still doesn't work.
  • You've exceeded your data allowance and data has been cut off.
  • There's a known network issue in your area.
  • You need a SIM replacement.

TDC Support (Denmark)

Contact Xiaomi Support if:

  • You've tried all steps above and data still doesn't work.
  • You've tested your SIM in another phone and it works normally.
  • Your device is a European/Global variant but data still fails.
  • You suspect a hardware fault with the cellular antenna or modem.

Xiaomi Support

Final Verdict

If your Xiaomi has no mobile data on TDC Denmark, follow this diagnostic hierarchy:

  1. Check if your SIM works in another phone – to isolate network/SIM issues.
  2. Check if another SIM works in your Xiaomi – to isolate device issues.
  3. Check that mobile data is enabled – the most basic, often overlooked step.
  4. Check APN settings – TDC's official APN is internet. This is the most common cause of data issues.
  5. Check for VPN, Private DNS, or Data Saver – these can block data even when signal looks normal.
  6. Reset network settings – clears corrupted configurations.
  7. Check for system updates – may contain modem fixes.

Contact TDC to check your account status, data plan limits, and local network conditions if none of these steps resolve the problem.

Frequently Asked Questions

What is the correct APN for TDC Denmark on Xiaomi?

TDC Denmark's official APN is internet. Authentication type should be left default, and APN type should be default,supl .

Why does my Xiaomi show 4G/5G but no internet on TDC?

This typically indicates an APN or data configuration issue. Check your APN settings and ensure they match the official TDC configuration (internet). Also check if VPN, Private DNS, or Data Saver are blocking the connection.

How do I reset network settings on my Xiaomi?

Go to Settings → Connection & sharing (HyperOS) or Additional settings → Backup & reset (MIUI) → Reset Wi-Fi, mobile & Bluetooth or Reset network settings. You will need to reconnect to saved Wi-Fi networks afterward.

Does Xiaomi work with TDC Denmark?

Most European/Global Xiaomi models work with TDC Denmark . However, imported China or India variants may lack frequency bands like B20 (800 MHz) and may not be fully compatible with the network . A missing frequency band does not always mean no coverage, but it can affect coverage in certain areas.

Why did I lose data on TDC after a HyperOS update?

System updates can sometimes affect modem or carrier configuration . Check if a newer update is available to resolve the issue. You may also need to reset network settings or verify APN settings after the update .

What frequency bands does TDC Denmark use?

TDC Denmark uses LTE B3 (1800), B7 (2600), and B20 (800) for 4G . B20 (800 MHz) is particularly important for rural and indoor coverage. TDC has also led Denmark's 5G rollout, now covering 99% of the country .

Note: This guide is updated for 2026. Menu names may vary slightly between HyperOS and MIUI versions. APN settings can vary by plan – always check TDC's official website for the latest settings.

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