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I am letting you know that my phone number has changed.
I made a tentative reservation by phone.
Please mind the time difference when you call.
Please call us to cancel.
Have you ever made an international call?
I'll explain the details over the phone.
It would help if you could call me by five.
I think we can settle this over the phone.
Sorry to interrupt the meeting, but there is an urgent call.
Let's make an appointment by phone first.
I'll organize my points before making the call.
Could you give me the direct phone number of the person in charge?