I have had a BlackBerry in the past and it was quite possibly the worst phone that I have ever used. I now have an iPhone and can safely say I won't be putting BBM on it in the near future because it was so unreliable in the past.
@vividlion: Even without me telling them to change, they already have either a Samsung or an iPhone on their other hands. LOL, isn't that why BB decided to do this? Whatever the reason is, I do hope this can help to improve communication generally. BB(M) was very exclusive, that's why.