In its TMT Predictions 2016, Deloitte India said India is estimated to generate about USD 1.7 billion for smartphone owners at an average value of about USD 90 in FY 2016 with outright sale or trade-in of approximately 20 million handsets.
"Growing at a CAGR of about 32 per cent till 2020, the used smartphone market is forecast to grow to about 46 million units generating an estimated USD 4 billion for its owners," it added.
Also, global sales of wearable devices is expected to be approximately 250 million units by 2018 and a major portion of the sales will be driven by North America and Europe.
"India is expected to have some participation in this segment. Fitness trackers and smartwatches will see mass adoption in the coming years and expect safety devices geared towards location tracking and emergency assist to also see significant adoption," it said.
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Mobile ad spends are expected to grow from current 2-4 per cent to 15-20 per cent of the overall media expenditure by 2020, it said.
Mobile advertising in India is the fastest growing among all segments in the digital advertising space and is gaining momentum through various apps and mobile sites.
"With telecom operators launching 4G and hi-speed Wi-Fi services, mobile-based internet connections are set to surge which will also fuel growth in social media users," Deloitte India Senior Director PN Sudarshan said.
In the coming years, Deloitte India expects digital-first brands (brands that can only be purchased online) to see strong growth across categories like budget fashion, furniture, jewellery and groceries.