According to a new study by global market intelligence firm Informa, smartphone instant messaging applications like iMessage and WhatsApp are more growing in popularity and even far outpacing traditional SMS, Fox News has reported. Last year, on average 19.1 billion messages were sent and received each day over the six most popular mobile chat applications, including Blackberry Messenger, Nimbuzz, Apple's iMessage, KakaoTalk, WhatsApp, and Viber. Informa estimates that 17.6 billion SMS messages were sent each day during the same year. The firm forecasts the chat app messages to double by the end of this year. The number of chat app messages sent each day will rise to 41 billion per day, compared with an average of 19.5 billion SMS messages, it said.