UK /ˈbɜː(r)nə(r) ˌfəʊn/
burner
or
burner phone
informala prepaid mobile phone that is used only once or for a short periodA burner phone was given to each guest with a code on it, which worked as their invite and gave them venue access.
When I travel I buy a burner.
This meaning is based on one submitted to the Open Dictionary from United Kingdom on 29/09/2014