More than 71% of Starbucks smartphone-carrying customers in the USA use BlackBerry smartphones or Apple iPhones.

The company revealed the statistic as it expanded its Starbucks Card Mobile payment service to nearly 300 stores in and around New York City. This test scheme, which started late last year, enables customers to pay for their coffee via their mobile phones by displaying an on-screen barcode that represents a 'real world' Starbucks Card.