It appears the vBulletin, the forum software AFF uses, has a mobility suite which provides applications for Android and Apple iOS. So the person running the forum pays $199 and they get two forum apps that can be re-branded as they like. Which I assume is what AFF have done. There is no Windows phone support yet from the vBulletin mobility suite, although they indicate if there is enough demand they might add it. If they do add support and my assumptions are correct then it will likely be quite trival for AFF to add support for it.