"How can I help you?"

This is a standard polite greeting when answering a professional call.

"This is [Your Name] calling."

Always introduce yourself clearly at the beginning of a call.

"Can I have extension [Number]?"

Use this when you know the direct internal number you wish to reach.

"Please hold and I'll put you through."

Inform the caller that they will be transferred after a brief wait.

"I'm afraid he's out at the moment. Can I take a message?"

Politely state unavailability and offer to assist further.

"Could you repeat the number please?"

A polite way to ask for information to be said again if you didn't catch it.

"I'll make sure [Name] gets your message."

Confirming that you will deliver the message reliably.

"Breaking up"

When the phone connection is poor and you can't hear clearly.

"Hang up"

To end a phone call.

"Call back"

To return a phone call.

"Grateful to / for"

You are 'grateful to' a person 'for' their help.

"Calling about"

The reason or topic of your call.

"In writing"

To send a confirmation by post or email.

"By Friday"

The deadline is Friday; it must be done on or before Friday.

"On the phone"

Currently busy with another call.