Ok here the Deal with the Dual Sim Cards.
From what I have been able to find is few major manfacters are just starting to jump on broad with dual Sims. So most of the smart phones you are going to find are clones of other phones.

Samsung has realse a couple:
B5712C
B5702
D780
SGH-D880
D980
D988
W629
(that all i could find)

LG
LG-KS660(My Favorite)

Then you have the chineses clones and knockoff. Which some reveiws stay are not bad

You and convert your phone in to a daul sim phone.
http://www.youtube.com/watch?v=50y9j7w72-E