Apple announced the iPhone 4 during its Worldwide Developer Conference on June 7, 2010 in Cupertino, CA. The device will be available in the U.S. on AT&T on June 24, 2010.
According to Apple, the iPhone 4 is the thinnest smartphone in the world, and is 24 percent thinner than the current iPhone 3GS model at just 9.3mm thick.
"This is our new baby. I hope you love it just as much as we do," said Apple founder and CEO Steve Jobs in wrapping up his keynote.
The iPhone 4 will be available in two colors (white and black), and sell in the U.S. for $199 (16 GB) and $299 (32 GB) with a two-year AT&T service contract. Users with an existing iPhone can upgrade immediately at the same prices. Users can get it up to six months early if their contract expires any time this year.
As for older models, the iPhone 3GS will go on sale for $99 in the U.S. starting June 24, 2010.
The iPhone 4's operating system (iOS4) features a a unified inbox and threading to see all email messages from a single conversation, as well as feature a new folder system, which automatically makes folders and names them based on category. The OS will also add better data protection and multiple Exchange accounts.
The iPhone 4 uses a microSIM card, has a new forward facing camera, as well as a unique integrated antenna system that puts the antennas along the exterior edge of the phone's body. The left side of the phone's stainless steel outer casing is home to Bluetooth, WiFi, and GPS antennas while the right side houses the UMTS and GSM antennas.
The phone also has a glass front face and a glass rear face, and both panels are scratch resistant and offer better optical quality. The side of the phone is also home to volume keys and a mute button. The top of the phone offers a second microphone for noise cancellation, a 3.5mm headphone jack, and a sleep/wake power button.
The display on the iPhone 4 uses a new "Retina display" technology that improves the sharpness of text and images on the screen for easier viewing by displaying 326 pixels per inch. According to Apple, when 10 to 12 inches away from the screen, the human eye can't make out individual pixels on this display. The Retina display offers a 960 x 460 resolution with an 800:1 contrast ratio, and uses In Plane Switching (IPS) technology that Steve Jobs says is preferable to the OLED displays currently in demand. Despite being a 3.5-inch screen, it has 78 percent of the pixels that the iPad's 10 inch display does.
The iPhone 4 is powered by an A4 processor designed by Apple and has a large battery that Jobs claims is good enough for up to 7 hours of talk time, 6 hours of 3G browsing, 10 hours browsing over WiFi, 40 hours of music, 10 hours of video playback, or over 300 hours of standby time.
Jobs also said that iOS4 has deeper enterprise support, which includes SSL VPN, Exchange Server 2010 support, and better security features for data and device management. Google, Bing, and Yahoo search are the default search engines in iOS4.
Apple iBooks will also launch with iPhone 4, along with the iBookstore for purchasing books, magazines, and other content. The phone is also capable for reading PDFs.