MIDP Java applications, SP MIDI tones, Nokia ringing tone and Nokia operator logo are defined as closed content types. Each content type is identified by an own MIME type. For example if the received MMS message contains any of the closed content types, the message cannot be forwarded to another phone or transferred to PC via PC Suite. Forwarding and sending of the following formats are supported: JPEG, GIF87a, GIF89a, WBMP, PNG, and unicode text. No forwarding is allowed for SP MIDI and the other closed content types listed above.