Gadget Savvy: Cell Phones Quiz
by Staff
In line at the corner deli, weaving through traffic, right next to you at a movie theater ... cell phones are everywhere. But are they really that different from walkie-talkies?

A cell phone is basically a sophisticated:

  • data recorder
  • radio
  • remote control

The cellular phone gets is name from:

  • the division of a geographic area into cells
  • cellular membrane technology
  • the grouping of different frequencies into cells

Unlike CB radios, cell phones use two frequencies, one for talking and the other for listening. This is:

  • half-duplex communication
  • multiple-duplex communication
  • full-duplex communication

The range served by each cell phone base station is about:

  • 5 square miles (13 square kilometers)
  • 10 square miles (26 square kilometers)
  • 25 square miles (65 square kilometers)

How do cell phones let you keep talking as you move in and out of different cells?

  • Your phone's transmitter sets up relays to get your signal to your initial location.
  • The Mobile Telephone Switching Office coordinates when your phone changes frequencies from one tower to another.
  • Your phone sends a stronger signal to reach the tower you were using when you started your call.

Your cell phone knows when you're roaming because:

  • The Mobile Telephone Switching Office (MTSO) checks your SID code in its database.
  • The global positioning system (GPS) chip in your phone informs the cell towers of your location.
  • The cell towers triangulate your position, and your phone's processor compares it to your service area.

How do digital phones let more people within a cell talk at once?

  • They transfer data quicker, so the frequencies aren't clogged.
  • They convert voices into binary code, compressing the calls.
  • They use higher frequencies than analog phones.

Cell phone cloning involves:

  • buying a phone and using someone else's account information to set it up
  • retrieving ID numbers from a phone and using them to eavesdrop or make fraudulent calls
  • transferring a SIM chip from an old phone to a new phone

Cell phones use lower-power radio signals because:

  • The signals don't travel very far.
  • Sending a signal doesn't drain the battery.
  • both A and B

A locked phone:

  • can work with only one specific provider's service
  • can work only in a limited range within a network
  • has no SIM card