Stay away from the O2 Stealth. It is the most buggy phone we've owned. it's too hard to use the hardware keypad for SMS, halos impossible na. Bought it for my wife last November, instead of gawing main phone, naging backup phone nalang sya.

Most PDA Phones are not network locked. Wala yatang capability na mai-lock ang mga ito, so no problem on this part.

Just make sure na English version ang OS ng phone, unless ok lang sa inyo ang Chinese ang mga menus. Although pwede naman i-flash yung ROM (OS) to English or vice-versa, mawawala naman yung warranty if you did so.