dial up vs ring in

dial up

verb
  • 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. 

ring in

verb
  • To make a phone call to (this place). 

  • To encircle, to surround in a ring, engirdle. 

  • To celebrate by ringing of bells or as if by ringing of the bells. 

How often have the words dial up and ring in occurred in a corpus of books? (source: Google Ngram Viewer )