To get Superfast 4G LTE, you'll need a LTE compatible device, an LTE SIM and take a MyPlan 3Gb (or more) data Bolt-on.
If you have an iPhone 5, 5s or 5c and don't already have Superfast 4G LTE (if you have, you'll be able to see 'LTE' on the top left hand side of your screen), you'll need to:
Check your iPhone has software version iOS 7.1 or higher. You can check this in your General Settings > Software update.
Visit one of our stores to upgrade your SIM to a new LTE compatible SIM. It's a simple swap.
You will also need to update your Carrier Settings once you have your new SIM, by connecting your device to the internet, tap Settings > General> About. If an update is available, a prompt will appear on your screen. Simply tap 'update'. Visit the Apple site for more information: http://support.apple.com/kb/ HT1970?viewlocale=en_US
Or, you can update your carrier settings by tethering your device to a computer with an internet connection, iTunes will verify if there is an update Carrier Bundle file. You then need to accept the download and install the new Carrier Bundle File.