I am pretty sure that the vast majority of mobile phones do not support Telepathy. While your comment is interesting for people consider desktop Linux development, it is a bit off-topic in a discussion about mobile platforms.
Maemo/MeeGo does, which means that a fair few Nokia phones and tablets do. I believe Sony's upcoming NGP will use Telepathy as well but I can't find a reference right now.
Regardless, my point was that the API has since been reproduced and is in wide use on non-mobile platforms, not that every mobile phone supports it.
Regardless, my point was that the API has since been reproduced and is in wide use on non-mobile platforms, not that every mobile phone supports it.