Before I bought this phone, my purpose in mind is to reduce my phones, because I have three SIM cards. I need a cheap dual SIM phone but mostly china phones are the leader in cheap dual SIM phone. I tried china phones but it didin't last for a month.

I already heard about Samsung Duo and there are no big brands that make dual SIM phone, Samsung maybe is the first one to introduce this among it's competitor. Samsung D880 Duos was announced October 2007 but released on December 2007.