Whoops Do you really need your Laptop while in phill? :P
Just back from a trip to Phill and we took over a Laptop for the wifes lill Sis. But to keep up with the world we found our "smartphones" were more than enough for day to day emails and what not.
With my blackberry I used the Globe blackberry service on PAYG (prepaid) which had various bb service im and most importantly unlimited Internet. Some days i used 20 -30 megs of data which is going some on a BB due to the way they compress the data. They now have different levels of service which are priced acordily.
Mostly I was using the phone to upload Photos straight to Facebook while we were out.
To do this on a UK roaming Sim would have cost hundreds if not thousands over 14 days or so.
Smart Globe and Sun have tens of PAYG deals so check out their offers. If your simply needing to check for emails or upload pictures to the cloud for not a huge amount you could find the 40 peso or so outlay for a sim (normally you get some free sms's in the deal and some free browsing time) a lot more handier than lugging round a laptop..