Level 1-2 Service Manual
July 5, 2005 9
Product Overview
The Motorola C139 features a global system for mobile communications wireless interface and
general packet radio service (GPRS) transport technology. It also features a simplified icon and
graphical user interface (UI) for easier operation in addition to short message service text
messaging (SMS), speed dialing, quick dialing, an alarm, a calculator, games, and an address
book.
C139 telephones support GPRS and SMS in addition to traditional circuit switched transport
technologies. GPRS, where available, provides substantial increases in mobile data
communications performance and the efficient use of radio spectrum. Data transmission rates
for GSM networks can potentially increase from the current rate of 9.6 kbps up to a theoretical
maximum of 171.2 kbps. An increased data rate is by no means the only benefit provided by
GPRS. A key advantage is the provision of a permanent virtual connection to the network. This
"always on" connection is possible because GPRS uses packet data transfer so that, for
example, email can be downloaded in "background mode." There is no need for the user to
reconnect before requesting a service, eliminating connection set-up delays and adding
convenience and immediacy to data services access. The "virtual" nature of this connection
means that network resources are not consumed during periods when a user is not actually
sending or receiving data.
The telephones are made of polycarbonate plastic. The display and speaker, as well as the 21-
key keypad, transceiver printed circuit board (PCB), microphone, charger and headphone
connectors, and power button are contained within clam shell form-factor housing. The phone
accepts 3V mini subscriber identity module (SIM) cards that fit into the SIM holder next to the
battery. These telephones feature a 96 x 64 pixel high-resolution color graphics display and an
external antenna.
Features
C139 telephones use advanced, self-contained, sealed, custom integrated circuits to perform
the complex functions required for GSM communication. Aside from the space and weight
advantage, microcircuits enhance basic reliability, simplify maintenance, and provide a wide
variety of operational functions.
Features available in this family of telephones include:
• A 96 x 64 pixel high-resolution color graphics display
• Internal antenna
• Lower voltage technology that provides increased standby and talk times
• Extended GSM (EGSM) channels
• Display animation
• VibraCall® vibrating alert
• 5-Way navigation key
• SIM Toolkit™ Class 2 (STK) (Network, subscription and SIM card or service provider
dependent feature. Not available in all areas.)
• Backlight
• Speed-, Quick- and One-Touch dialing
• Call Forwarding and Holding
• Customized Menus
• Personal management tools calculator with currency converter, and clock with date
• Other features
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