Huawei 5G kit must be removed from UK by 2027

If the protocols used for mobile networks were designed to be secure, most of the infrastructure couldn't do anything worse than a DoS attack. It'd still need some trusted servers for key management, but those could be standard hardware with relatively simple software.

If China can cause a denial of service attack on a country by remotely bricking all the network infrastructure or even slowing it down to a degree, this would still be economically devastating at the least.