Simply put, 2G allows you to send text messages.

Second generation mobile network known as GSM. Take a look at our 5G explained page for FAQs and more information on how to get 5G. O2 Business customer? Find out how 5G can transform your business. We now have 5G in parts of most major UK towns and cities, as well as lots of smaller towns and villages. This new technology has the power to connect buildings, transport and services in ways we’ve never seen, completely revolutionising everything from the way traffic flows on our roads, to the way we receive health care. But it’s 5G’s impact on the world around us that’s even more exciting. The power of 5G on personal and business devices will give everyone a better and more reliable connection in extra busy places, delay-free downloads and buffer-free streaming. We also have over 16,000 O2 Wifi hotspots available to connect to for free, which offer speeds up to 10 times faster than a normal mobile connection. If it's available with your device, you can use our Wifi Calling service make calls, receive calls and send and receive text messages when you have no signal. When you have no signal, you can use Wifi to call and message instead. How do I get a network connection when I don't have any signal? If you need more help with solving signal issues, visit the O2 Community where our Gurus will be able to offer more advice.

If you think there might be an issue with your device or sim:

Instructions on how to take these steps can be found using our device-specific trouble-shooter here. Resetting your network settings (this will also reset Wi-Fi networks and passwords, cellular settings, VPN and APN settings that you’ve used before).Choosing the O2 network manually in your settings.Making sure mobile data is turned on in your settings.If there’s no known issue, try manually resetting your device by: Use the O2 network status checker to see if there’s a known network connection problem in your area, or to report an unknown issue to us. From here, you’ll be able to subscribe to updates using Keep Me Posted. What should I do if I’m having signal issues?

Speedtest 5g map