LG Electronics VX5300 SID is used by mobile phones to, Serving system, To display on the TTY

	SID is used by mobile phones to
	recognize when they are in their home
	system and can be used for billing
	purposes as a unique identification of
	the serving system.
SMS	Short Message Service is a service
	available on most digital mobile phones
	to send messages between phones or
	other devices. Messages are routed to a
	Short Message Service Center (SMSC),
	which attempts to send the message
	and, if unsuccessful, possibly retry at a
	later time. Message delays or message
	loss is possible, especially when
	sending between networks. Users can
	request delivery confirmation reports.
TTY	Teletypewriter. An electromechanical
	typewriter that either transmits or
	receives messages coded in electrical
	signals. A phone with TTY support is
	able to translate typed characters to
	voice or translate voice into characters
	to display on the TTY.

VX5300 103