SMS vs text message

SMS

verb
  • To send a message on a cell phone. 

noun
  • SMS — Seiner Majestät Schiff – literally, "His Majesty's Ship" in German; 

  • A ship prefix for a ship in the navy of the Empire of Germany (usually for the period leading to WWI and WWI) 

text message

verb
  • To transmit a text message. 

noun
  • A brief electronic message sent between mobile phones. 

How often have the words SMS and text message occurred in a corpus of books? (source: Google Ngram Viewer )