1. Problems
1.1. abuse
1.2. pornographic text messages
1.2.1. dating
1.3. discouraging face to face content
1.3.1. weaken people communication skills
1.3.1.1. espeacially among teenagers and the olderly
1.4. HK people can't live without smart phones
2. The transformation of function
2.1. applications
2.2. networking
2.3. taking photography
2.4. texting
2.5. Form 1G to 4G
2.6. games
3. increasing popularity of mobile phone
3.1. reasons
3.1.1. among teenagers
3.1.1.1. peer pressure affects teens to purchase the latest smart phones
3.1.2. easier to carry
3.1.3. much more function available
3.1.4. New node
3.2. Trends
3.2.1. Iphone
3.2.2. samsung
3.3. actual figure
3.3.1. 232 million people
4. Background
4.1. component
4.1.1. The circuitboard
4.1.2. Antenna
4.1.3. Microphone and Speaker
4.1.4. Battery
4.1.5. Optional Components
4.2. Types of cell phone
4.2.1. First Generation Cell Phones
4.2.1.1. usage
4.2.1.1.1. voice calls
4.2.1.2. method of signal trasmission
4.2.1.2.1. frequency modulation
4.2.2. Second Generation Cellular Phones
4.2.2.1. usage
4.2.2.1.1. voice calls and caller identity
4.2.2.1.2. text messaging
4.2.2.2. example of 2G cell phones
4.2.2.2.1. GSM
4.2.2.2.2. GSM900
4.2.3. Third Generation Cellular Phones
4.2.3.1. smart phone
4.2.3.1.1. apple
4.2.3.1.2. samsung
4.2.3.1.3. Motorola
4.2.3.1.4. sony
4.3. History of Cell Phones
4.3.1. since1946