You can retune your device to check to make sure your channels are up to date, to re-scan, go to settings on your device > general > TV channels > re-scan. This should update your channels. Make sure you have your aerial connected to your device.
You can retune your device to check to make sure your channels are up to date, to re-scan, go to settings on your device > general > TV channels > re-scan. This should update your channels. Make sure you have your aerial connected to your device.