It differs in that you can use Telegram on multiple devices (though only one phone) and you can't send messages to non-Telegram users.
Ịnwere ike iji Telegram na ọtụtụ ngwaọrụ (ọ bụ naanị na otu ekwentị), ị nweghị ike izipu ozi na ndị na-abụghị ndị Telegram.