Your using smart so all you have to do is to roaming your number. It will gonna work when your in HK then and your family will deducted 1 peso per text to you. See to it that your phone is TRI-BAND.Pls activate your roaming service an hour before of departure.Here is details, you may call the costumer service through your phone free of charge and they can do it manually to you or via text..Be sure too that you will have lots of load coz there is a maintaining balance.I think 500 daily not sure about it...so call

Customer service for your Philippines prepaid SIM card is available 24 hr./day by dialing *888 at any time from your Philippines cellular phone. From a landline, dial +63 (632) 888-1111. You may also send a text message to 888 from your handset.

If your a Globe Subscriber and you want to roam your number any part of the world:Even UK

You can call the customer service through your handy phone dial 211 . They can do manually to activate your number or via text that will charge you 27.50 pesos.
Okay let say your leaving on Monday just type GROAM ON 08/07/2006 180 send 2884... (note:its with spaces )
180 is the maximum days to avail the roaming service. If your going back to PI you have to deactivate your number by typing GROAM OFF send 2884.
Plus you have to maintain the daily balance 100..your family will be charge 1 peso only per text, but if your going to reply them they charge you 15 per text. for outgoing calls is 80per minute and incoming calls is 60 pesos per minute.

I hope it helps