tama sabi nilang lahat. try calling your provider first, if you got your phone from them, they have the code to unlock it. My brother did this for his Motorola V500 which was under contract with Cingular at that time, and he used it sa Pinas for 3 mos. But make sure its a multi-band phone. Kaso, kung medyo natatakot ka mag-uwi ng phone sa atin, sa atin ka na lang bumili kahit 2nd hand lang. Tutal di mo naman masyado gagamitin after ng trip mo e. But if price difference is a question, start looking out for the prices, both in Ebay and sa Pinas. Ofcourse have someone you know from the PI to look for a cellphone of your choice to know the price. Then just compare. Sa chargers naman, usually the chargers are auto-volt chargers (100v-240v input) so check your charger, nakasulat lang yan somewhere. If it only says one of the two numbers, most likely 110v, then as said above, you need a converter/transformer.