Via SMS - Text GROAM ON and send to 2884.
To activate your roaming service for a specific period - Text GROAM ON to 2884 (i.e. GROAM ON 06/18/2013 27).
Via Twitter - Tweet to @talk2GLOBE to request roaming activation.
At least PhP 100 minimum balance to activate roaming service.
At least PhP 50 maintaining balance to continue using your roaming services after activation.