The British telecoms group, India's largest mobile operator after Bharti Airtel, has begun work on the prospectus that would incorporate the Indian unit's financials for the first half of the calendar year, they said.

Vodafone hired Bank of America Corp, India's Kotak Investment Banking, UBS AG in April as global coordinators for the IPO, set to be India's biggest stock market listing since 2010.

A London-based Vodafone spokesperson declined to comment on the timeline, saying the potential India IPO was a "lengthy process" and no decision would be made until the company was at the end of it.

Sources declined to be identified as the information is not public.

--reuters--