We use Whatsapp a lot in Europe, but business fronts still communicate with phone and email. Meanwhile, in Indonesia, everything is on whatsapp! You book an hotel? whatsapp message. You need a taxi? whatsapp! you want to order in room service? send a whatsapp message, there’s not even a phone in the room. A tour guide will contact you directly on whatsapp, if you don’t have it installed, good luck.