Systems and methods for using wireless communication devices to track the effects of advertising are described herein. In some embodiments, a method includes representing the identity of an advertising impression, that is, a specific advertisement, with an impression code. According to exemplary embodiments, the advertising impression is directed to at least one commodity, such as one or more products and services. The method may also further include receiving the impression into a computer-readable memory of a wireless communication device. The method further includes detecting the wireless communication device, and then providing the impression code during the purchase of the commodity. The method continues with obtaining the identity of the advertising impression from the impression code. The method additionally includes creating a transaction record, wherein transaction record includes the advertising impression identity and an identity of the commodity, and storing the transaction record in a database.