dial in

Meaning

Verb

• To configure or set up, particularly a complex machine with many configuration options (especially knobs and dials).
• To connect to a system or service by telephone.
• To join or participate in a conference call.
• To apprehend and align oneself (to an idea, circumstance, way of thinking, etc.)

Origin

• dial + in, from tuning in to a radio frequency by changing the dial, or dialling a telephone number (originally on a rotary dial).