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samsung-gt-i9000 and samsung-galaxy-s are about the same device. The full name of the device is: Samsung Galaxy S GT-I9000. So I would suggest it as a synonym, but I don't have the reputation yet.
If someone with > 2500 reputation agrees, please suggest the synonym. :-)
My first thought was that the name Galaxy S actually refers to a series of 9+ devices, but we should probably make the synonym you suggest and create samsung-galaxy-s-series is there's a need for it.
I've merged and synonymized the tags.