Wise words of warning from Jim here!!!
I have heard of, and seen similar stories from people I have met over here.
Get off the plane - take out your UK SIM and shove a SMART SIM in it (P50) - and relax in the knowledge that you are not going to get a nasty surprise from your UK provider.
My experience only cost me £250 - but it still gave ME a shock!!!
BTW - I use Skype for contacting Blighty - but if I am not near my PC then I send a text at, as has been said, P20.
BTW part 2 - If your UK phone is locked and is not operable with a SMART SIM or similar, buy a cheap Nokia or summat over here - expect to pay around £10 - £15 for a decent (oldish) phone. Voila!!! Use your new mobile without any worries - AND - in the LIKELY event that it gets nicked whilst you are on a jeepney - you haven't lost much.
If you are going to bring an expensive mobile over here - PLEASE BE CAREFUL!!!! Remember what has been said in previous threads.
Al.