Local smartphone brands including Micromax, Celkon, Swipe and Karbonn have adopted Indus OS

Indus OS - a mobile phone operating system built in India - has become the country's second-most popular smartphone platform, surpassing Apple's iOS.

Google's Android rules the roost by powering nine out of 10 smartphones sold in India.

And Mumbai-based Indus OS has been quietly making rapid inroads by plugging that gap.

Now, it's not exactly a new operating system built from scratch, but the developers have tweaked the Android platform to meet the unique demands and culture of India.

"We wanted to create a product specifically for the Indian consumer," Rakesh Deshmukh, co-founder and chief executive of Indus OS, tells the BBC.

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