As a UK citizen, my general assumption is that the systems security of all telco equipment and the operational security of all telcos is so poor that both the U

As a UK citizen, my general assumption is that the systems security of all telco equipment and the operational security of all telcos is so poor that both the US and China can covertly access our networks, no matter who made the equipment. Pretty much no complex software stands up to scrutiny if you're willing to put $100M into cracking it. Until some equipment vendor starts shipping a software stack that is both open-source and formally verified, it seems that situation will persist. Can't see that happening anytime soon.