Get on line and Pick up

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

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

Get on line and pick up are semantically related. Sometimes you can replace phrase "Get on line" with "Pick up", this terms are similar.