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Facebook has said it is investing $5.7bn (£4.6bn) in cut-price Indian mobile internet company Reliance Jio, which is owned by the country's richest person Mukesh Ambani.

The deal makes the social network the largest minority shareholder in the telecoms unit of Reliance Industries, with a 9.99% stake.

It gives Facebook a major foothold in India, where its WhatsApp chat service has 400m users and is about to launch a payments service.

"This investment underscores our commitment to India, and our excitement for the dramatic transformation that Jio has spurred in the country," Facebook said in a statement.

Facebook also said that it plans to focus on the collaboration between WhatsApp and Reliance's e-commerce venture JioMart to enable people to connect with businesses, shops and purchase products.

In February this year WhatsApp Pay was granted permission by Indian authorities to start a phased roll-out, two years after the start of a trial version of the service.

In a separate statement Reliance Jio said the agreement will be good for both the company and the country as a whole: "This partnership will accelerate India's all-round development, fulfilling the needs of Indian people and the Indian economy."

By Nikhil Inamdar, ´óÏó´«Ã½ India business reporter

Reliance Jio is the most valued subsidiary of Reliance Industries, the oil-to-telecoms conglomerate. The company has been able to upend India's telecoms market in this short span by offering very low data prices, which has allowed it to keep competition at bay.

With a presence across a suite of services such as mobile telephony, live TV, music streaming and payments, Facebook will be looking to drive synergies across services and further consolidate its position in India.

This deal also comes in at a particularly opportune time for Mr Ambani, who has been making a concerted effort to reduce the debt on his books. He's ploughed in a reported $25 billion into Jio in recent years towards capital expenditure. At a group level Reliance's liabilities have jumped to $65 billion in financial year 2019, from $19 billion in 2015. The Facebook deal will be a critical element of Mr Ambani's ambitions to cut net debt to zero by March 2021.

Mr Ambani has confirmed that his digital new commerce platform Jio Mart will collaborate with Whatsapp in the near future to help "mom and pop" shops transact digitally with their customers in the neighbourhood.

Since launching in 2016 Jio has attracted some 370 million subscribers to its service. That rapid growth has seen the company borrow large amounts of money and the deal with Facebook will help it to deliver on its plan to cut net debt to zero by March of next year.

India is seen as a key market for the growth of both Facebook and its WhatsApp messaging platform. The number of internet users in the world's largest democracy will grow to around 850m in 2022, according to consultancy firm PwC.

The move marks a further tie-up between the Indian telecoms platform and US technology giants. Last year Microsoft announced plans to partner with Jio to offer cloud computing to businesses.

The deals come as the Indian market has become increasingly difficult for American companies to get into, as the government has imposed new restrictions to overseas businesses operating there.