WhatsApp is the most popular mode of communication these days. The popularity of the app has now led an Italian company to launch a new SIM called WhatSim, a SIM that lets you use the messaging service even on roaming without the need for Wi-Fi or data connection. So, how does it work? WhatSim is compatible with 400 operators across the world and works in about 150 countries. It easily connects to a provider network and in case you change your position, it automatically searches for a new provider. In case a provider with better signal is available, then it automatically connects by itself without the user even noticing it, explains the company. The SIM could not only be a boon for anyone who loves to travel. This way, they can stay connected with their dear ones, without incurring any roaming charges. The WhatSim costs  €10  that translates to approximately  Rs 714 . At this price, you can chat for free all over the world for a year. WhatSim has neither fixed costs nor m...