Why Is My SIM Card Not Working

Diagnosing why your network internet has stopped working

Step	Action	What It Fixes
1	Check your network network status	Confirms if issue is network-wide
2	Toggle aeroplane mode on/off	Re-registers SIM on your network network
3	Restart your phone	Clears temporary network errors
4	Check your network APN settings	Fixes incorrect data configuration
5	Re-insert SIM card	Fixes poor SIM contact issues
6	Contact your network support	Resolves account or SIM faults

Publishing order: 467 • Cluster 41: FAQ High Search

If your internet connection is slow or mobile data is not working properly, this Why Is My SIM Card Not Working | UK Mobile Guide guide will help you configure everything correctly.

Use this guide to fix setup problems, mobile data issues, signal problems and UK mobile network settings with clear steps and related guides.

If your phone shows no service, slow mobile internet, hotspot issues, a blocked SIM, roaming failure or an APN problem, start with the steps below before changing advanced settings.

Restart your phone and wait for the mobile network to reconnect.

Check that your SIM settings, cellular data and roaming settings are correct for your plan.

Open mobile internet settings and confirm the APN configuration has not been removed or saved incorrectly.

Follow these steps in order — most issues are resolved by step 1 or 2

Quick checks before resetting your network APN settings

Open your phone settings, select Mobile Network or Cellular Data, then review the APN profile. Save the settings, restart your device and test browsing, picture messages and hotspot if your plan supports it.

Internal guides to check next

For stronger results, follow the network hub first, then continue through APN, MMS, eSIM, roaming and fix guides. This structure helps users and search engines understand the full topic clearly.

UK APN Settings Troubleshooting Why Is My Mobile Data Not Working How to Reset APN Settings What Are APN Settings APN Settings Explained What Is eSIM and How It Works How Roaming Works Back to full blog order

Frequently Asked Questions

Why is your network mobile data not working?

your network mobile data may stop working due to an incorrect APN, a temporary network outage, an expired data plan, or a SIM issue. Follow the steps in this guide to identify and fix the cause.

How do I reset my your network APN settings?

On Android: go to Settings → Network → Mobile Networks → Access Point Names, then tap the menu and select 'Reset to default'. On iPhone: go to Settings → General → Transfer or Reset iPhone → Reset → Reset Network Settings.

Does your network have a network outage in my area?

Check the your network website or their social media channels for real-time outage information. You can also check third-party sites like Downdetector for user-reported your network outages.

Why does your network show signal but no internet?

If your network shows signal but no internet, the APN settings may be incorrect or missing. Check the APN settings on your device and compare them to the correct your network values in our APN guide.

How long does a your network outage usually last?

Most your network network outages are resolved within a few hours. For planned maintenance, your network usually notifies customers in advance. Check the your network status page for current updates.