Using Call Guard
Call Guard is an option that helps you manage your roaming
charges when making or receiving calls while outside the
network available to you. With Call Guard enabled when you
are roaming, you must press
(Yes) at the prompts,
“Roaming rate applies. Place call?” to make a call and
“Answer?” to answer an incoming call.
To set Call Guard:
Press Menu > Settings > Roaming > Call guard > On or Off.