English version

be on the telephone

From Longman Dictionary of Contemporary Englishbe on the telephonebe on the telephonea) TCTTELEPHONEto be talking to someone, using the telephone I was on the telephone when he came in. b) TCTto have a telephone in your home, office etc telephone
Examples from the Corpus
be on the telephoneFrom 6am Brown is on the telephone.The Sheikh arrived while the doctor was on the telephone to the hospital.I told him who I was on the telephone.She loves to be on the telephone.She must not ask who was on the telephone.
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