Systems and methods for message-based advertising in a wireless communications network are described. A digital message is contained in a data packet set in transit from a terminal of a sender to a terminal of a recipient. At least one of the terminals is implemented as a mobile telephone. The digital message is received through a network connection. A processor determines a context for the digital message and matches the message context to content of advertisements stored in an advertisement database in order to identify at least one relevant advertisement. The data packet set is transmitted to the terminal of the recipient. A processor retrieves the relevant advertisement(s) from the advertisement database and generates a confirmation message containing a delivery status of the data packet set. The confirmation message includes the relevant advertisement and is transmitted to the terminal of the sender.