2Factor - Solv Technologies
2Factor ( 2Factor.in ) is a mobile messaging platform, offering telecom APIs for implementing messaging (SMS & VOICE) use cases. Over 1000 SMBs ( including some of the well known Banks, Mutual fund companies, IT companies, Government entities ) rely on 2Factor's Robust messaging platform for sending OTPs (One time password messages), Bulk SMS & Transactional messages to their clients.
2Factor specializes in providing Phone verification / OTP verification & Bulk SMS Services and is presently the only vendor in India, offering 15 seconds delivery guarantee else refund. It supports OTP delivery to 180+ countries and manages direct connectivity with India's TIER-1 telcos ( viz. Vodafone, Airtel, Idea )
They also offer APIs for broadcasting promotional / marketing campaigns and for sending non-promotional ( Transactional messages ). Checkout 2Factor's offerings in detail at https://2Factor.in