Apple the makers of iPhone introduces its most awaited generation next device and world’s thinnest smart phone iPhone 4. The iPhone 4 is sleeker and more advanced than the first iPhone. Like the iPhone 3GS, it comes in black or white, though it has a more angular look. Its front and back are covered with glass, and it is rimmed with stainless steel that acts as part of the antenna.

iPhone 4 comes with multitasking user interface allows its users to quickly switch between recently used apps. Just double-click the Home button to reveal your recently used apps. Then scroll towards right to see more applications and then tap on one to reopen it. No need to wait for the app to reload. The iPhone 4 equipped with FaceTime that makes the dream of video calling a reality earlier was not available in on iPhone, and Apple’s stunning new Retina display, the highest resolution display ever built into a phone, resulting in super crisp text, image, and video. iPhone 4 is about three-eighths of an inch thick; the 3GS is nearly half an inch. It can shoot high-def video, catching up to some other smart phones. It has a gyroscope in addition to other sensors, to enable more advanced motion-sensing applications, such as games and mapping services.

The display on the smartphone remains 3.5 inches diagonally, but Jobs noted that it can show four times more pixels the individual colored dots that make up an image as the previous screen. With its large Multi-Touch display and innovative software, iPhone lets you control everything using just your fingers. A panel laminated on the glass senses your touch using electrical fields. It can register multiple touches at once to support advanced gestures such as pinch to zoom, two-finger tap, and more. The panel then transmits the information to the Retina display below it.

One of the most noticeable changes is the iPhone’s new camera on the front that can be used for video conferencing, in addition to a 5 Megapixel camera with LED flash, HD video recording. Currently the conference function works only if both parties have an iPhone 4 and on WiFi. And with its advanced backside illumination sensor, it captures beautiful images even in low-light settings. The built-in LED flash does double duty. When you’re taking pictures, it works as a flash. When you’re shooting video it can stay on to light up the scene. And on the front of iPhone 4, the built-in camera is perfect for making FaceTime calls and shooting self-portraits.

In addition Apple’s A4 processor, a 3-axis gyro, and up to 40 percent longer talk time — in a beautiful all-new design of glass and stainless steel that is the thinnest smartphone in the world. iPhone 4 comes with iOS 4, the newest version of the world’s most advanced mobile operating system, which includes over 100 new features and 1500 new APIs for developers.

The battery on the new iPhone 4 will allow up to seven hours of talk time – an improvement over five hours on the last model. It can handle up to six hours of Web browsing over cellular networks or 10 hours over WiFi. iPhone 4 will use Micro SIM, instead of a regular SIM card. This means none of your older SIM cards will work, However now a day most of operator providing the Micro SIM. The iphone 4 will be available in the US at $199 (US) for the 16GB model and $299 (US) for the 32GB model. Prospective customers can pre-order their iPhone 4 beginning June 15th from the Apple Online Store.