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Your example is in the past tense, so it should read "suddenly she just hung up."
In AmE, "hanging up" is almost always used to refer to the termination of a telephone call. (The earliest telephones were always wall-mounted, and the receiver literally hung from a hook, which is how this expression developed.) I believe in BrE they sometimes say "ring off," but one of our UK members can better answer than.
ring off, hang up 
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