How do I make a *111* Voice Call while roaming?

Simply dial:
*111*<00><country code><area/mobile code><telephone number><#>
OR
*111*<+><country code><area/mobile code><telephone number><#>

Your call will be routed to Digi’s network before disconnecting. You will then receive an incoming call on your mobile in 15 seconds.
Upon answering, a dial tone will indicate that you have been connected to your destination number. If the person you are calling does not answer within 40 seconds, your call will be ended and you will be charged accordingly.

Examples:
Malaysian Mobile Number (e.g. 016 221 1800)
Dial *111*0060162211800# OR Dial *111*+60162211800#

Malaysian Fixed Line Number (e.g. 03 1234 5678)
Dial *111*006031234567# OR Dial *111*+6031234567#

International Number (e.g. 1234 5678 in Singapore)
Dial *111*006512345678# OR Dial *111*+6512345678#