Premium MMS Short CodesOn a technical level MMS differs entirely from SMS, and is based not on SS7 but on IP signalling standards and internet content standards such as JPEG and MPEG for images and video respectively.
MMS is sent differently to SMS. When sending a peer to peer SMS, the SMS message is sent from an end user's handset to their mobile operator's SMS Centre (SMSC), and is then sent directly to the recipient end user's handset, irrespective of which network the recipient of the SMS is on. The SMS does not get routed from the SMSC of the sender's mobile operator to the SMSC of the recipient's mobile operator.
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Premium MMS for Multimedia
This is not the case when sending a peer to peer MMS; Any Premium MMS message (sent to a MMS Short Code) must go through the mobile operators' home MMSCs (assuming they are not roaming, whereby the roaming network's MMSC would be used). An MMS from an end user will be sent to that end user's mobile network MMSC, then sent on to the MMSC of the recipient's mobile operator, before being sent on to the recipient end user's handset. This process when charged, is known as Premium MMS. MMS Short Codes can be set up for Premium Rate services.