Definition of roaming in US English:

roaming

noun

  • The practice of using a mobile phone on another operator's network.

    ‘EU officials have been cutting the fees companies can charge for roaming’
    as modifier ‘turn your phone off to save on data and roaming charges’

adjective

  • Moving about aimlessly or unsystematically, especially over a wide area.

    ‘roaming herds of reindeer’

Pronunciation

roaming

/ˈrōmiNG//ˈroʊmɪŋ/