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I'll call you back later.
Could you call me back?
Thank you for calling.
I'm having trouble hearing you.
Can you talk on the phone now?
I left a message on your voicemail.
He is on another call right now.
Could you tell me your phone number?
I think you have the wrong number.
Please hold the line.
Could you call back in five minutes?
I'm in a meeting, so I'll call you back later.