ja lei works for an i.t. firm in shanghai. ef of the beijing branch, he has been going on business trips several times a year. his smartphone has become an irreplacement part of his routine. since online financial services began, jai hardly ever carries around cash. he uses the qr codes of various stores to pay for purchases. ♪ store clerks check customers' phones to finish payment. in china, there is no service charge for deposits within the same bank in a city. but a charge is applied for remittances from bank "a" to bank "b." financial service companies using smartphones have partnerships with all banks, enabling individuals to transfer money between any bank without paying a charge. now any small vendor in beijing can allow payment via smartphones. that's because no equipment is needed. sellers simply download apps on their smartphones, register their bank account and personal details, and print out a qr code which customers scan to pay. even street vendors can enable smartphone payments. this is the apartment where jai liv