Covering 250 merchant locations in Bengaluru, the six-month Tap and Pay project represented the largest mobile NFC proximity payment trial of its kind to date.

Describing the programme as a "watershed event" in the history of mobile financial services, consultancy Edgar Dunn and Company says the pilot successfully demonstrated clear demand for mobile proximity payments.

Noting that a total of 43,257 transactions were made over the six-month period, Moyer says the math fails to back up the assertions.

"Assuming this is approximately 180 days, that means somewhere around 240 mobile payments occurred per day," says Moyer. "With 250 participating merchants, this comes out to <1 transaction per day per merchant."

The Japanese market is often cited as a success story by proponents of contactless and mobile contactless solutions, where consumers are estimated to make 1.8 contactless retail transactions per month per contactless device, and 4.7 customers make a contactless transaction on each contactless point of sale (POS) per day.

"This is not yet a success story," says Moyer. "The estimates for the Citi trial in India and the Japanese market don't imply that adoption is insignificant, but they don't back up the success stories depicted."

Not averse to a bit of hype itself, Gartner in May last year forecast that the number of people around the world making payments using their mobile phones would soar from 43.1 million in 2008 to 73.4 million in 2009, a 70% rise.

By 2012, the company predicted the number of people making m-payments will hit 190 million - more than three per cent of total mobile users - as it becomes "mainstream".