Get on the line and Pick up

Pick up and get on the line are semantically related. in telephone topic. In some cases you can use "Pick up" instead a verb phrase "Get on the line", when it comes to topics like communicate through telephone system.

Pick up verb - To acquire complete knowledge, understanding, or skill in.

Get on the line and pick up are semantically related. Sometimes you can use "Get on the line" instead a verb "Pick up".