The issue with telepathy is that it has potential to be straight up mind reading, which probably makes it either very difficult, very illegal, or both. Even if there was a perfectly safe message sending spell, extrapolating a mind reading spell or even something even more sinister like a subconscious suggestion spell from it wouldn't be too farfetched. And that's not even going in to issues such as the effective ranges of a telepathy spell, and other issues of practicality.
One too many cases of "Crap, did I think that out loud?"
I bequeathe myself to the dirt, to grow from the grass I love;
If you want me again, look for me under your boot-soles.
Then they need to start building them there teleo-phones.
So does that mean that all successful applicants to Celestia's school get a dragon? Or is the entry exam different every time?
Pony Express
, anyone? :P
"Ponies are antidepressants." -edvedd
Seen it before, but it's still pretty good.
Good morning pony-bros. On the subject of communication, I think that Equestria is close to or at the level of modern-day human civilization when it comes to technology, but Ponyvillians just prefer to live simply, and we haven't seen any privately-owned homes in Canterlot, so yeah.
ZABUNGAH
So that would explain DJ turntables, sound equipment and arcade machines.