I don't have an iPhone so I can't really help ya. Hard to believe there isn't one thou. I did a quick search on the google play store for android and found like 6 apps that say they do both google and yahoo groups.
I won't be wronged. I won't be insulted. I won't be laid a-hand on. I don't do these things to other people, and I require the same from them. - John Bernard Books(John Wayne in The Shootist)