Open source hardware is all similarly untrustworthy
You can't just mine materials and bring them to a factory and make a phone, the machinery is all controlled by a global deep state cartel. Russia is buying 20 year old machinery and spending billions of dollars and years of time just to make a big drama show out of pretending to defy the global deep state with 20 year old shit. In theory next year they'd be able to make a CPU almost on par with the original iPhone, but still not the rest of the phone, and they're still just pretending to not be part of that global deep state cartel.
You can't make deals with hardware manufacturers to get anything made without being on board with the deep state cartel.
None of the phones currently even really try to pretend to be open source by using a RISC-V CPU and stuff, they just slap an "open source" label on a phone and leave it at that. Same as Google does with Android, only more exaggerated.
What I'd really be interested in is a phone manufacturer that doesn't blatantly openly lie, but I don't see how that can happen in the foreseeable future. It seems like it would take a movement of people who actually care enough to use critical thinking to identify deceptive behaviors and boycott electronics as much as possible until the global deep state starts letting honest people get their designs made and marketed.