The event showcases new technology like Artificial Intelligence and sixth generation mobile networks.
India has created more than 7,700 patents for next‑generation telecom, including 4,400 international ones.
More than 150,000 people, 500 partners, 600 startups and 900 experts are expected to attend.
New focus areas include smart transportation, stadium experiences, industrial robots and transport technology.
The fair brings together scientists, engineers and visitors from over 100 countries.
Mobile data became much cheaper, dropping from 268 Indian rupees per gigabyte in 2014 to just 8 rupees now.
People now use about 36 gigabytes each month, a huge increase from 0.26 gigabytes.
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