As new mobile communication technologies are becoming broadly available, there is urgent pressure to populate them with services that provide returns for the huge investements made by telecom operators. Services around video transmission are expected to playa key role: news broadcasting, videoconferencing, movie channels, on-line gambling, etc. The goal of the STREAMOBILE project is to demonstrate an Internet pay-per-view distribution system toward GPRS and UMTS mobile devices. Copyright-protected contents are streamed to the customer and a micropayment scheme is used so that contents are not paid for in advance, but as they are being received by the customer. This paper presents an evolving prototype, whose client software has been designed in such a way that it can be easily migrated to 3G mobile devices.