You don't need to change your mobile phone card to travel to Britain. What kind of Internet access is more cost-effective?

If you travel to Britain, buy Unicom CUniq card directly! This card can bind two numbers, one in China and the other in Britain. You can make calls without changing your card, and roaming charges are free, which is very convenient. This card directly has a data roaming package, which can directly open traffic anytime and anywhere, and the price is not expensive.