You're no doubt already familiar with WhatsApp as one of the best messaging apps ... as the other messaging apps out there. If you need all the bells and whistles of an instant messenger, like ...

Furthermore, users can now share sticker packs through WhatsApp chats, facilitating more dynamic and expressive conversations ...

Offer your best promotions and get to the point, already -- or customers will unsubscribe just as quickly as they opted in to receive your instant messages.

They are not just free alternatives to SMS texting. Smartphone owners turn to messaging apps for much more than instant messages. Messaging app users trade emojis, digital stickers, GIFs ...