there shouldn't be any compatibility problems, we usually get our phones from taiwan, no issues naman. basta gsm 900/1800 compatible pwede.
mga suggested models ko:
o2 stealth - slider phone with standard keypad para sa mga sanay sa normal phones. screen is slightly smaller than sa other o2 models like the mini. if ur new to pda phones, very good phone to help you transition. value for money altho di lang nga sya 3G.
approximately Php29k http://www.seeo2.com/product/XdaStea...ProductInfo.vm