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BilltoMobile's Jim Greenwell says the company is seeing about $3 million a month in transactions over the phone, with growth rates ready to jump.
The carrier is allowing customers to make purchases on the phone and have the charge sent to their cellphone bill.
Verizon customers will be able to make purchases on their phones by typing in their phone number.
American Express continues its push into the emerging space of mobile purchasing, making a $19 million investment in mobile-payments provider Payfone.