No, I do not since I am an individual which has no need for such high security/trust. A military of a certain nation certainly could (and probably should tbh). But I could if I wanted to, and I can’t say the same for iOS. The difference with open source is that I can choose if I trust them or see it for myself instead.

Korea can ask Samsung, a local company, to make a secure phone. No need to open the doors to American spies.

Nice that you ignored that a country (Korea) can vet code, instead setting up a strawman of “can you vet source code”.