Most known brand AP PDA phone actually original.
Unlike some Nokia phone which easily dissected, local supplies (non authorized dealer) has evil plan. They replace the case or keypad to cheaper one & sell the original case & accessories for profit, wala there u go for AP set.
But for AP PDAphone mostly has original warranty, but ONLY applicable to country it should be sell. ie imported Singapore. Imitation phone, KIRF (look alike) consider AP set because only local or underwater supplier bring them. Dont expect authorize dealer bring it here because they know its sucks to be clone.
Best way before buying make research & reading review of your desired devices. Its important to understand how its operated and interface. So you dont get cheat to buy "Sumsung Galataxy S2" comewith dual sim, TV antenna and running windows mobile..
How to determine SME set?, especially for s plus and s 2.