Gadget Savvy: Cell Phones Quiz
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
- 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