cellular mobile vs roaming

cellular mobile

noun
  • A mobile phone which is linked up to a cellular network. 

roaming

noun
  • The ability to use a cell phone outside of its original registering zone. 

  • Using the OS service of manipulating folders and documents from different PC devices by a registered user. 

  • The use of a network or service from different locations or devices. 

  • An instance of wandering. 

How often have the words cellular mobile and roaming occurred in a corpus of books? (source: Google Ngram Viewer )