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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.