Just because you're paranoid, it doesn't mean they aren't trying to get you! What this boils down to is who do you you trust least? If you buy American stuff, you can bet the Yanks are spying on you, if you buy Chinese then the Chinese are spying on you and so it goes on. the big difference is that the UK and USA have strategic intelligence gathering alliances and share similar cultures and world views. Not so China and Russia and North Korea, these countries are the biggest threat to us and should be least trusted. What deranged and naive lunatic would put "enemy" equipment at the heart of the UK's telecomms network?