the caxton site explains everything very well, i believe 1st you apply for card when you recieve it you must top it up online to activate it, with your uk mobile no/ registered with them, recomend having it for roaming while away,, you can top up just by txting top up to them while your in phil, but read the caxton site it will explain it all to you , anything your not sure about just email them, they are very helpfull,
ps/ you can change the pin number they give you to your own choice number,in most atm s, but that must be done in uk.
i suggest you take your normal bank cards with you as back up, and tell your bank you wish to use them in phil on those dates, so you dont find they are blocked, you been away before abroad so i guess you already know