Rubbish. Asda Mobile are giving away 12gb data when you join for up until the new year. They'd be a good backup network.
It depents where you live for me EE's 4G is great and O2 is too but 3, vodafone and other networks are not good.
Please not that some networks don't offer 4G at all.
are they all asking you to sign up for 12 months or more? gg don't