Abstract: A method for messaging between an enterprise and clients of the enterprise who each have a mobile device operatively connected via a wireless communication link to a telecommunication network, and wherein at least two clients have different wireless service providers. The method includes receiving a plurality of message files from the enterprise, each message file including a client identity and message information; associating a wireless device and a wireless service provider with each client identity; composing a mobile-terminated message to the wireless device of the identified client as a function of the message information; and delivering the message to the client wireless device. The method also provides receiving a mobile-originated message from the client in response to the mobile-terminated message and, thereafter, composing and delivering a second mobile-terminated message to the same wireless device as a function of at least one data field within the mobile-originated message.