I think they call it a "flip phone". It's a phone you flip open. It sounds weird to say you can flip it open, because it's the only way to use it.
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CalifJimThe first one sounds better.English phones are really adept then!
Maybe it's the fact that the subject ("phone") is not an agent (can't do any folding) bothers you?
Don't let that bother you. This occurs quite a lot in English.
CJ
we say something but are by no means aware of its full connotations and always wonder what a native would say in that particular situation. a foreign language is like an uncharted territory in which we can never be sure when we will step on a mine.