Can I buy an iPhone in China and use it in the US?

Also note that a Chinese iPhone syncs to Chinese-hosted servers, and the government has access to the contents of anything you sync to iCloud.

Excellent point, Lawrence! I did not think of that.

Yes, you can. In China, their iPhones provide two physical SIM card, and can not support e-sim.

If the US carriers can provide you physical SIM cards, you can use your the Phone in US.

Be very careful. Note a Chinese-purchased iPhone will not be serviceable in the U.S. should it require service. And Apple’s warranty will not apply outside the country where purchased.