IPhone OS 2

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iPhone OS 2 was introduced at the Apple Worldwide Developers Conference keynote address on June 9, 2008.
iPhone OS 2 was released on July 11, 2008. It was released alongside the iPhone 3G and ran on the first-generation iPhone as well.

• A new built in app called the App Store was added. Before the application was introduced, the only way to install custom applications on the device was via jailbreaking, which was unsupported by Apple. 500 applications were available for download at the launch of the App Store.
• The Mail app had a redesign, with push emails that provide an always-on capability. It also supports Microsoft Office and iWork attachments. Other new features include support for true BCC, multiple email delete, and the ability to select an outgoing email.
• The ability to save images has been added.
• On the iPhone, the iPod app gained the ability to create music libraries.
• The ability to set the default language to Norwegian, Swedish, Danish, Finnish, Polish, Dutch, Korean, Brazilian, and Portuguese was added.
• The software now supports WPA2 and 802.1X internet protocols.
• The Contacts app and iTunes Store app both get redesigned home screen icons, though the latter only affects the iPod Touch.
• A search bar was introduced to Contacts alongside the ability to import SIM contacts.
• MobileMe support has been added.
• The calendar app gains the ability to create multiple at a time, which are color-coded to differentiate each other.
• When the device is in landscape mode, the calculator app displays a scientific calculator. The app icon was also updated.
• Settings now can turn Wi-Fi back on while in Airplane mode, as well as the ability to turn Location Services on or off.

Rene Ritchie at iMore said, "Overall, iPhone Firmware 2.0 is a stunning achievement that really puts the iPhone on par with the Apple II and Mac as one of the great revolutions in modern technology. It takes it beyond simple Phone + iPod, or even smartphone, and makes it the leading contender for the next great shift in computing." However, they criticized it for having stability issues and overall sluggishness.

Macworld said, "The iPhone 2.0 software is full of the kind of refinements that you'd expect from a second-generation Apple product. The iPhone OS still isn't perfect, and we wish Apple had addressed some lingering shortcomings, but it's a welcome step-up for what was already arguably the best mobile platform on the market."

The update from iPhone OS 1 to iPhone OS 2 was free for iPhone users; however, it cost $9.95 for iPod touch users, due to accounting rules and the need to comply with the Sarbanes-Oxley Act. These accounting rules were later changed after lobbying from Apple and other software companies. Free copies of the iPod touch update circulated online. Minor updates to iPhone OS 2 were free for iPod touch users.