You may call the Roaming Hotline 730 1212 and have your cousin's International Roaming activated.
chen17 you can help your cousin on below possible solutions
1. If postpaid, should be automatic, if not manual search of network can help
2. or here : Roaming Activation
3. Tweet @talk2GLobe and ask assitance for roaming activation.
For prepaid, a php100 maintaining balance is required to activate the roaming service.