It is not designed mostly for iphone but for new smartphones. Galaxy S uses the old OMTP connection (left, right, mic, ground) and if the R1 mic'd version was made for it it wouldn't work with the new phones and any DAPs without an adapter. So, it's not an issue with the R1 - if you had a Galaxy S3 it would work.
That's correct. I've tested on both Galaxy S2 & S3 and it works well with both of them