India - the worlds second largest market for more or less everything - is Android territory when it comes to mobile devices. Indians generally ask one question while purchasing a cell phone...does it run WhatsApp? Most will not use an email program in their lives, business is conducted on WhatsApp.
So, Facebook (WhatsApp) and Google (Android) has the country divided equally among themselves.
There is no Apple ecosystem in India. All the "iDevices" are niche products used by the minority upper class/upper middle class. Step into a crowded first class compartment of a Mumbai suburban train and you will spot countless Samsung Galaxy phones, a smattering of Huawei, Micromaxx, Xiaomi, ZTE, MotoG etc and may be one or two iPhone's. Its not going to change unless Apple competes on price.