As of October 2013, Apple's App Store offered more than a million apps by Apple and third parties Apple has released nine generations of i Phone models, each accompanied by one of the nine major releases of the i OS operating system.
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The i Phone 6 and i Phone 6 Plus further increased screen size, measuring at 4.7 inches and 5.5 inches, respectively.
In addition, they also feature an A8 chip and M8 motion coprocessor.
The i Phone 6S, i Phone 6S Plus, and i Phone SE all feature Apple's new dual-core 64-bit A9 chip, 2GB of RAM, a GT7600 (6-core) GPU.
1st gen, 3G, and 3GS: Wi-Fi (802.11 b/g) 4, and 4S: Wi-Fi (802.11 b/g/n) 5, 5C, and 5S: Wi-Fi (802.11 a/b/g/n) 6 / 6 Plus, 6S / 6S Plus:, and SE: Wi-Fi (802.11 a/b/g/n/ac) 1st gen, 3G, 3GS, and 4: Bluetooth 2.1 + EDR 4S, 5, 5C, 5S, and 6 / 6 Plus: Bluetooth 4.0 6S / 6S Plus and SE: Bluetooth 4.2 The user interface is built around the device's multi-touch screen, including a virtual keyboard.
The i Phone has Wi-Fi and can connect to cellular networks.
An i Phone can shoot video (though this was not a standard feature until the i Phone 3GS), take photos, play music, send and receive email, browse the web, send and receive text messages, follow GPS navigation, record notes, perform mathematical calculations, and receive visual voicemail.
Other functions—video games, reference works, social networking, etc.—can be enabled by downloading mobile apps.
The i Phone 4 featured a higher-resolution 960×640 Retina Display, a VGA front-facing camera for video calling and other apps, and a 5-megapixel rear-facing camera with 720p video capture.
i Phone 5 features the dual-core A6 processor, increases the size of the Retina display to 4 inches, introduces LTE support and replaces the 30-pin dock connector with an all-digital Lightning connector.