The hottest part of the mobile space is the cheap, sub-$100 device. Need proof? Google, at its annual I/O developer's conference in San Francisco, announced AndroidOne, a program to seed reference designs to hardware makers in order to speed up the process of bringing the latest hardware to price-sensitive consumers. AndroidOne phones will have stock Android, Google Play auto-installs, and automatic updates.

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Hardware OEM Micromax already has a device ready that will retail for under $100. In addition to a 4.5-inch screen, it'll pack developing-world friendly features such as dual-SIM support and an FM radio. This device -- and future AndroidOne devices -- will compete directly with Motorola's inexpensive Moto G and Moto E, as well as Microsoft's inexpensive Windows Phones.

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