To telephone, to call on the telephone.
To connect a computer to a modem.
To increase the level (of something) by turning a dial, or (figuratively) as if by turning a dial.
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.