Now, there are new releases of services & products that allow you to run TrueCaller Flash Messaging campaigns which can be utilized to send messages to your audience via TrueCaller which is a mobile app used by people for identifying the callers.
Also check List of WhatsApp Messenger Marketing Chatbots, Autoresponder & Autoreply Tools which talks about latest version of Smartbots, Chatbots and Autoreply Tools released for operating your WhatsApp Bots this week with WhatsApp releasing it's official WhatsApp Business API
And Telegram Marketing Tools at List of Telegram Marketing Software, Tools, Scripts & Solutions