I'll call back later

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I'll call back later.

a standard phrase indicating that a telephone caller will call again at a later time. Sally: Is Bill there? Mary (speaking into the telephone): Sorry, he's not here right now. Sally: I'll call back later. John (speaking into the telephone): Hello. Is Fred there? Jane: No. Can I take a message? John: No, thanks. I'll call back later.
See also: back, call, later