• Use our O2 network status checker to check if the nearby mast is working as sometimes, we may carry out maintenance work on it. Register your details on My Network Portal to get network status updates, so you'll know when it's been fixed.
• If there aren’t any mast issues, try turning airplane mode off and on again in your device settings. This will refresh your connection.
• You can still make calls when you have no signal by using Wifi and 4G Calling. Set up Wifi and 4G Calling and find out more.
• To improve your connection, make sure your phone’s software and security settings are up-to-date. Use our device-specific troubleshooter for help.

There are lots of things that may temporarily impact your service including weather, infrastructure, the number of people in your vicinity trying to connect, and whether we are yet to identify a local network issue.

Learn more about network congestion, a common network issue you might be experiencing.

If you’ve tried the steps above and are still having issues, you can report the problem through our status checker here or using the My Network app, so we can investigate it further.

The coverage checker is based on coverage predictions, and can never be 100% accurate because of things like trees, buildings and hills affecting actual coverage. We try to make sure our predictions are as accurate as possible and have edited the coverage checker to consider these coverage limitations.

Learn more about the ways different environments impact network coverage.

You can use the network status checker or the My Network app to check for any known issues with our network, or to report a problem.

Use our O2 network status checker to check if the nearby mast is working, as sometimes we may carry out maintenance work on it. Register your details on My Network Portal to get network status updates, so you'll know when it's been fixed.

If there aren’t any issues on the status checker, follow these next steps:

• Make sure mobile data is turned on in your phone settings
• Try and connect to a local WiFi hotspot
•  If you have a spare phone, check if your sim works in it
• After following all these steps, if you still can’t access the network, go to your phone settings and reset the network settings

If you need more advice and are still having connectivity issues, pop into your nearest O2 store where one of our team will happily help.

Use the My Network app to keep an eye on your coverage, wherever you are. Download the app and you’ll be able to:

• Check the status of our network in your area – you don’t even need to enter your postcode 
• Test your network speeds
• Report any issues with your service
• Sign up to receive updates on any reported network issues.

It is simple to use and you can check the network right from your phone.

Learn more about how we monitor and fix your network issues.

You can contact the emergency services by dialling 999 from your O2 phone, as long as you are in range of our network. If you are not within range of our network, or if the network is not available for any reason, your device or mobile phone may try to use another mobile network to connect your call to the emergency services.

Depending on the device you use, your approximate location (using network, global positioning satellite network information and Wi-Fi data) may be provided to the emergency services via functionality built into the device.

Experiencing slow data speeds at a busy central location? See if you can connect to one of our 16,000+ free wifi hotspots, and boost your speed by up to 10x. Learn more about O2 Wifi.

No signal? No problem, with Wifi Calling. Whether you’re at home, in a coffee shop or at the office, if you’re having a signal problem, you can use Wifi to call as normal. And 4G calling lets you make calls over 4G, meaning clearer calls. Learn more about Wifi and 4G Calling.

O2 Customers can enjoy access to wifi on the Underground with Wifi Extra. Wifi Extra is available in ticket halls, walkways, on escalators and platforms at over 250 Tube stations – that’s over 95% of the London Underground network. Learn more about Wifi on the Underground.