Twitter has agreed to buy the Times Internet-backed mobile marketing company for a price reported to be about $40m.

Microblogging platform Twitter confirmed today that it has agreed to acquire India-based mobile marketing company ZipDial, providing an exit to investors including internet holding company Times Internet.

Twitter did not disclose what it paid for ZipDial but reports last week suggested the price was likely to be around the $40m mark.

ZipDial’s mobile platform enables users to make a missed call to a number for free, in turn alerting the recipient to send information to their phone through a…