Samsung SCH-I920DAAVZW - Manual (Page 106)

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How wireless works
Your wireless service is different from your home or
business phone service. On a wireless device, you must
press the SEND button to alert the network to connect
your call. Unlike the calls you make on a home or
business phone, wireless communications travel over
the air and can react to the environment. Rain, snow,
fog, falling leaves, water, mountains, canyons and even
buildings may affect service. All wireless service is
subject to “dead zones,” or no-coverage areas.
Verizon Wireless network technology
Verizon Wireless offers CDMA (Code Division Multiple
Access) digital network technology to most of its
customers. CDMA digital technology offers many
benefits compared to analog, such as less static,
enhanced voice clarity, increased privacy and longer
battery life. A CDMA digital phone is necessary to
subscribe to our digital service. Verizon Wireless
only sells digital wireless devices that are E911
compatible and either all-digital or tri-mode, which
means you may use analog or CDMA digital services
on different frequencies.