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O2 5G Not Working

📅 Last updated: 17 May 2026

O2 5G Not Working guide with steps, settings, troubleshooting, FAQs and related UK mobile network fixes.

O2 5G Not Working — UK APN Hub guide

Does O2 support 5G?

Step Action What It Fixes
1Check O2 network statusConfirms if issue is network-wide
2Toggle aeroplane mode on/offRe-registers SIM on O2 network
3Restart your phoneClears temporary network errors
4Check O2 APN settingsFixes incorrect data configuration
5Re-insert SIM cardFixes poor SIM contact issues
6Contact O2 supportResolves account or SIM faults

Yes, O2 has an active 5G network across the UK, with coverage continuing to expand. To use 5G on O2, you need a 5G-capable device, a O2 SIM on a 5G-enabled plan, and to be within O2's 5G coverage area. Check coverage at the O2 APN hub.

How to enable 5G on O2

On Android: Go to Settings → Network & Internet → Mobile Network → Preferred Network Type and select 5G/4G/3G/2G (auto) or the highest available option. On Samsung, go to Settings → Connections → Mobile Networks → Network Mode.

On iPhone: Go to Settings → Mobile Data → Mobile Data Options → Voice & Data and select 5G. If the option is not visible, your iPhone model or carrier plan may not support 5G on O2.

O2 5G APN settings

The APN settings for 5G on O2 are the same as the standard mobile data APN. Your phone should use 5G automatically once it is enabled in your network settings. If 5G is not appearing in the status bar despite being in a covered area, try toggling aeroplane mode, restarting your phone or resetting your APN settings to the O2 defaults.

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Fastest way to apply new APN settings
After saving, turn aeroplane mode ON for 10 seconds, then turn it OFF. This forces an immediate network re-registration — quicker than a full restart and equally effective.

Troubleshooting O2 5G problems

5G not showing: Check your plan includes 5G. Ensure your device supports 5G. Verify you are within O2 5G coverage. Go to network settings and set the preferred network type to include 5G.

5G slow: 5G speeds vary by location, network congestion and signal strength. Move to an area with a clearer line of sight to a mast. Ensure no background apps are consuming data. Contact O2 if speeds are consistently poor in your area.

5G connected but no internet: Check APN settings are correct for O2. Reset network settings. Try switching to 4G, testing mobile data, then switching back to 5G.

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Troubleshooting — Try Steps in This Exact Order STEP 1 Toggle Aeroplane Mode STEP 2 Full Restart your phone STEP 3 Delete & re-enter APN from scratch STEP 4 Reset Network Settings ⚠ STEP 5 Contact Network Support ⚠ Step 4 (Reset Network Settings) will delete: • All saved Wi-Fi passwords • All Bluetooth pairings and VPN configurations Note your Wi-Fi passwords before using this step. 💡 Most issues are caused by: • Wrong APN text (one typo stops everything) • APN saved but not selected (no filled circle) • Phone not restarted / aeroplane mode not toggled

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

📚 Related O2 Guides

Frequently Asked Questions

Why is O2 mobile data not working?

O2 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 O2 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 O2 have a network outage in my area?

Check the O2 website or their social media channels for real-time outage information. You can also check third-party sites like Downdetector for user-reported O2 outages.

Why does O2 show signal but no internet?

If O2 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 O2 values in our APN guide.

How long does a O2 outage usually last?

Most O2 network outages are resolved within a few hours. For planned maintenance, O2 usually notifies customers in advance. Check the O2 status page for current updates.