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1. Describe the functionality of accelerometer of an iphone

 iPhone responds to motion using a built-in accelerometer. 

The accelerometer detects the movement and changes the display accordingly, at the time of rotating iPhone from portrait to landscape.

2. Explain about the applications that can be used with iphone

Technology, Entertainment and Design(TED): Allows to watch and listen to world's most fascinating people have to say, all on the iPhone. 

Market Watch: Breaking news about the investments can be seen. To do so, open the Stocks app and rotate.

Trends: Latest runway shows, videos from Vogue's fashion library, reviews, exclusive party pictures, fashion news updates can be seen on Style.com. 

3. What are sensors in iphone?

 The proximity sensor immediately turns off the display when the iPhone is lifted to ear. With this sensor the power is saved and accidental dialing is prevented. 

The display is automatically brightens the iPhone by the ambient light sensor when the sunlight or bright rooms and dims in darker places. 

4. What are the features of iphone 3gs?

Video: Videos can be edited, shared. High quality VGA video can be shot in portrait or landscape. 

3 Megapixel Camera: Still photos with greater quality can be taken

Voice control: It recognizes the names in contacts and recognizes the music on iPod.

Compass: iPhone 3GS has built-in digital compass, used to point the way.

Internet Tethering: Internet surfing can be done from anywhere. A 3G connection can be shared on Iphon3 with Mac notebook or laptop.. 

5. What are the location services?

 Applications such as Maps, camera and compass are allowed to use the information from cellular, Wi-Fi and Global Positioning System networks for determining the approximate locations. 

The location is displayed on the screen, using a blue marker. 

6. What is iphone architecture?

 It is similar to MacOS X architecture 

It acts as an intermediary between the iPhone and iPod hardware an the appearing applications on the screen

The user created applications never interact directly with the appropriate drivers, which protects the user applications from changes to the hardware. 

7. What is iphone OS?

 iPhone OS runs on iPhone and iPod touch devices. 

Hardware devices are managed by iPhone OS and provides the technologies needed for implementing native applications on the phone.

The OS ships with several system applications such as Mail, Safari, Phone, which provide standard services to the user. 

8. What is iphone reference library?

 iPhone reference library is a set of reference documents for iPhone OS . 

It can be downloaded by subscribing to the iPhone OS Library doc set.

Select Help>Documentation from Xcode, and click the subscribe button next to the iPhone OS Library doc set, which appears in the left column. 

9. What is iphone sdk?

 iPhone SDK is available with tools and interfaces needed for developing, installing and running custom native applications. 

Native applications are built using the iPhone OS's system frameworks and Objective-C language and run directly on iPhone OS.

Native applications are installed physically on a device and can run in presence or absence of network connection.

10. What is iPhone?

  • IPhone is a combination of internet and multimedia enabled smart phone developed by Apple Inc.
  • iPhone functions as a camera phone, including text messaging, and visual voice mail
  • iPhone is a portable media player that resembles a video iPod
  • It has user interface that is built around the multi-touch screen including virtual keyboard.
  • App Store , which launched in the mid 2008 has over 1,00,000 applications with functionalities including games, references, GPS navigation, advertising, television shows, films, reference, celebrities.