1. A system operable to permit a user to initiate a service invocation with a communication device coupled to a communication network, comprising: a service invocation identifier preprogrammed in the communication device for identifying a service invocation; an interface in the communication device configured to receive input from the user or display information to the user; a processing engine in the communication device for receiving a multi-function code based on the input to the interface and comparing the multi-function code with the service invocation identifier to determine whether service invocation is requested; and one or more of a communication channel or a messaging protocol available to the communication device to communicate with the communication network, the processing engine being operable to send information related to the service invocation using the one or more communication channel or messaging protocol when the processing engine determines that the multi-function code matches the service invocation identifier.