Only for Apple. I'll state again, how many unlocked phones were very easy to find stateside a few years ago. None of those phones had FCC approval, but were easily found on the web, and in many legitimate businesses.
Except Apple isn't selling them in China. It wasn't that long ago when many US citizens were purchasing unlocked phones from overseas. Those phones were not FCC approved, and weren't sold on the black/grey market. They were easily found in many legitimate retailers.
Do any of those devices need government approval before being able to be sold?What's funny is before the iPhone became insanely popular worldwide it was consumers in the US that were buying unlocked phones from overseas because they weren't available stateside.