To join a phone call or video call.
Used other than figuratively or idiomatically: see hop, on.
To begin playing a video game.
To call (someone) using a telephone.
A device for transmitting conversations and other sounds in real time across distances, now often a small portable unit also capable of running software etc.
A speech segment that possesses distinct physical or perceptual properties, considered as a physical event without regard to its place in the phonology of a language.