Multimedia Messaging Service (MMS) is a form of multimedia message used to send various media such as images, text, audio clips and video clips –in any combination.
SMS stands for Short Messaging Service and is a standard text-based mobile message.
Automated Voice Messages (AVM) are pre-recorded voice messages that are sent to recipients as voice calls.
IVR (Interactive Voice Response) messages are automated, two-way communications that enable customers to complete an agentless system. This can also be used in a competition scenario whereby a competition entrant can call in to a number to listen to T&Cs for example, as one of several options available.