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Please call us to cancel.
I think we can settle this over the phone.
I made a tentative reservation by phone.
Let's make an appointment by phone first.
Call the main number and ask for the extension.
Could you give me the direct phone number of the person in charge?
I am letting you know that my phone number has changed.
Please leave a message on the voicemail.
Please mind the time difference when you call.
I called back right after hearing the voicemail.
Have you ever made an international call?
The voicemail was full, so I could not record.