Hmm, I've never quite managed to find what all these problematic corner cases actually are. The bit that jumps out from your link is the fact they now support

Hmm, I've never quite managed to find what all these problematic corner cases actually are. The bit that jumps out from your link is the fact they now support iOS, and iOS won't let them programatically send/receive SMS. It seems to be a case of "now we support iOS, to keep feature parity, we're stripping out our main feature!" -I insert my own <slowclap /> at this point.