Abstract: A method of selectively providing multimedia content to a content receiving device comprises determining whether a first content stream provided to the content receiving device meets a predetermined criterion. Responsive to determining that the first content stream does not meet the predetermined criterion, at least one other content stream which meets the predetermined criterion is selected for provision to the content receiving device.

Abstract: A method for detecting the presence of a ringback tone in a ringing tone comprises comparing the ringing tone to a benchmark tone so as to detect the presence of a ringback tone. Based on the comparison, a notification is provided as to whether a ringback tone is present.

Abstract: A method of providing a purchaser with a confirmation of a transaction includes providing the purchaser with an electronic machine-readable image, such that the electronic image may be displayed on a screen of a portable or handheld electronic device to verify the transaction. The image may be any displayable and visually readable indicia. The system includes a transaction validation device for issuing the electronic machine-readable image in response to a financial transaction, a network interface means, and a portable or handheld electronic device for receiving the electronic machine-readable image for display on the screen of the portable or handheld electronic device to verify the transaction. The system also preferably includes an optical scanner for reading the barcode image from the display.