To use 4G on our network, you'll need to make sure you've got the latest software version available for your iPhone.

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You'll also need to check to make sure you've got 4G coverage in your area. If our 4G network isn't available in your location yet, you can check our list to see if we're bringing 4G to your area in You should also make sure that 4G is enabled on your phone.

iPhone 5S And 5C Won't Be Compatible With O2 4G For Weeks

If for some reason you decide you don't want to use 4G yet, you can also disable 4G on your phone. If you want to use 4G , make sure it's switched on. If you just want to connect to our 3G network, make sure Enable 4G is switched off. But you can argue that O2 will be launching with a bit of a setback: its initial rollout of LTE will not support the iPhone. This is not a free upgrade, in that users still need to sign up for a new contract on the new device. In June of this year it announced , customers and is aiming for 1 million by the end of this year.

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It looks like O2 made a point of acting as fast as it could; it notes that the news comes a day after Ofcom cleared the use of spectrum for 4G services. You don't need to worry about 4G calling using your data, either, as the service uses your minutes instead. Wi-Fi and 4G calling is only available to O2 customers on pay monthly, SIM-only or business tariffs and these should receive a notification for a software update very soon.

O2 says texts and data problems have now been fixed after more than 24 hour outage

O2 says more devices will be added over time as well. The service is also currently limited to London, Leeds and Slough, but more UK cities will be added over the coming months. To update your phone, follow these instructions:. Once you're running the latest software, you can then activate Wi-Fi calling by following these steps:.