

It’s like being a plumber.
The plumber comes over, looks at the problem, says hmm, taps on pipe and charges you $500.
You’re not paying for the hammer or the 30 seconds of work. You’re paying for the 25 years it took them to learn what to do so that it fixes the issue.
The hammer is fungible. The plumber is not. Don’t be the hammer.





Hmm. I think the issue with all these phones is that the modems can support those bands just fine but they’re generally tuned for Asian and European markets. Predominantly because those sorts of phones sell en mass there still, maybe.
For example, I have a duoquin F22 pro (think modern Nokia). I know that folks over on XDA have flashed CFW to region unlock them for US.
You might be able to find what you want (the Cubots sound like a near match) quite cheaply but you’ll have to check XDA for CFWs first. Quite a few of these phones ship with unlocked bootloaders and AOSP by default so they are pretty easy to tinker with.
Else… How do you feel about the JellyStar?
https://www.unihertz.com/products/jelly-star