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phone (one) up
To call someone on the telephone. Here's my number—phone me up sometime, and we can go see a movie or something. I have to phone someone up about the branches that blew down in our neighborhood overnight.
phone someone up
to call someone on the telephone. I don't know what he will do. I will phone him up and ask him. Phone up your brother and ask his advice.
To telephone someone or something: I didn't understand the contract, so I phoned up my lawyer for help. She told her client that she would phone him up after lunch to review what they had discussed.