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I'll explain the details over the phone.
Let's make an appointment by phone first.
Please call us to cancel.
Could you give me the direct phone number of the person in charge?
I made a tentative reservation by phone.
Please leave a message on the voicemail.
Call the main number and ask for the extension.
I called back right after hearing the voicemail.
I am letting you know that my phone number has changed.
The voicemail was full, so I could not record.
Please mind the time difference when you call.
There were three voicemails when I got home.