This document introduces EKO/-, a mobile financial services platform that allows any cell phone user to perform transactions like an ATM. It discusses how EKO/- leverages existing mobile networks and retail distribution infrastructure to provide branchless banking services at a very low cost per transaction of Re. 1/-. The platform works across all mobile operators, devices, and technologies. It also describes how EKO/- digitizes transactions and signatures for money transfers using only mobile phone numbers. As of the date of the document, EKO/- has over 4 million customers, 2,600 counters, and has facilitated over $1 billion in 10 million transactions across several Indian states since being founded in 2007.