Facebook has created a new “missed call” product for advertisers in India, marking the first time that the social network has designed a special ad format for a single country.

When a mobile phone user clicks on one of the ads, it calls the advertiser and immediately hangs up. The advertiser returns the call with pre-recorded entertainment content and a marketing message – enabling the consumer to avoid paying data charges.

Facebook’s creation of a special ad product in India, where the company has more than 100m users, is part of a broader push to develop customised solutions across emerging markets.