For details about what 4G is, how it works and why it is only now being launched in the UK see our guide to what you need to know about 4G.
When the first 4G network launched last month, Consumer Editor Chris Choi looked at the considerable cost of joining this new generation.
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This defeat for Theresa May matters: it shows the fury among some MPs, notably those who voted to Remain, that they are being ignored.
Theresa May's government has been narrowly defeated in a key Commons vote after a rebellion by Conservative MPs.
Despite temperatures reaching double figures in the south today, it was still a chilly day, with brisk winds.