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speech
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n |
most
important and widely used service
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n |
uses
discontinuous transmission and voice activity detection
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– |
transmit
at about 40% of time, when user actually speaks
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– |
complete
silence at receiver unnerving - comfort noise
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data
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n |
different
services available, depending on end-to-end
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transmission
type, transmission mode, terminal capability
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n |
supports
data rates of 300 bps up to 9600 bps
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facsimile
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short
message service
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n |
alphanumeric
messages of up to 160 characters
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n |
messages
saved on SIM
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