dial up

— Phrasal Verb with dial

/daɪəl/ verb [I or T] (UK -ll-, US -l-)

Definition

› [I or T] COMMUNICATIONS to call a telephone number: I dialled up the answering service and found two messages. Someone had found his office number on an internet phone directory and dialed him up.

› [I or T] INTERNET, COMMUNICATIONS to connect to a network or to the internet using a dial-up modem: The broadband connection is always on, so there's no need to dial up any more.

(Definition of dial up from the Cambridge Business English Dictionary © Cambridge University Press)