SIM Card Registration Failed

Why your your network SIM is showing an error

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

This guide covers SIM Card Registration Failed for UK mobile users. Whether you are on your mobile network or another UK network, the information below will help you get the best from your mobile service.

Common your network SIM error codes and what they mean

UK mobile networks operate on 4G and 5G infrastructure across England, Scotland, Wales and Northern Ireland. Coverage, speeds and included features vary by plan and location. Always check your network's latest coverage map and plan details before making changes to your settings.

Fixing your network SIM not detected or not registered

If you need help with your your mobile network service, the UK APN Hub has live chat, phone support and a community forum. You can also find answers in the UK APN Hub blog, which covers APN settings, eSIM setup, roaming, MMS and troubleshooting for all major UK networks.

Getting a replacement SIM from your network

Use the links below to explore related guides covering the same network or topic area.

Frequently Asked Questions

How do I contact your network UK support?

You can contact your network UK customer support through their official website, via live chat, by phone, or through their social media channels.

How do I check my your network signal strength?

Check your phone's signal bars in the status bar. For a detailed reading, go to Settings → About Phone → Status (Android) or dial *3001#12345#* (iPhone) to open Field Test mode.

What should I do if your network has no service?

If your network shows no service, try toggling Aeroplane Mode on and off, restarting your phone, and checking the your network coverage map for your area. If the issue persists, contact your network support.

How do I keep my number when switching to your network?

To keep your number when switching to your network, request a PAC code from your current provider by texting 'PAC' to 65075. You can then give this code to your network when you set up your new account.

Does your network support WiFi calling?

Many your network plans support WiFi calling. Check your your network account settings or the your network website to see if WiFi calling is available on your plan and how to enable it.