Tracker program for iPhone XS
These changes came in the wake of reported issues with unexpected shutdowns on certain iPhone models following the release of iOS In response to criticism over the practice, including concerns over this being a form of planned obsolescence , Apple announced that it would offer discounted battery replacements for iPhone 6 and newer in , and that it would add additional battery health information on a future version of iOS iOS Since July , third-party battery replacement kits have been available  at a much lower price than Apple's own battery replacement program.
These kits often include a small screwdriver and an instruction leaflet, but as with many newer iPod models the battery in the first generation iPhone has been soldered in. Therefore, a soldering iron is required to install the new battery. The iPhone 3G uses a different battery fitted with a connector that is easier to replace. A patent filed by the corporation, published in late July , revealed the development of a new iPhone battery system that uses location data in combination with data on the user's habits to moderate the handsets power settings accordingly.
Apple is working towards a power management system that will provide features such as the ability to estimate the length of time a user will be away from a power source to modify energy usage and a detection function that adjusts the charging rate to best suit the type of power source that is being used. The first-generation iPhone and iPhone 3G have a fixed-focus 2. It has no optical zoom, flash or autofocus , and does not natively support video recording.
Video recording is possible on the first-generation iPhone and iPhone 3G via a third-party app available on the App Store or through jailbreaking. The iPhone 3GS has a 3. The iPhone 4 introduced a 5. It also has a backside-illuminated sensor that can capture pictures in low light and an LED flash that can stay lit while recording video. Saved recordings may be synced to the host computer, attached to email, or where supported sent by MMS.
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The iPhone 4S' camera can shoot 8-MP stills and p video, can be accessed directly from the lock screen, and can be triggered using the volume-up button as a shutter trigger. The built-in gyroscope can stabilize the image while recording video. The iPhone 5 and iPhone 4S , running iOS 6 or later, can take panoramas using the built-in camera app,  and the iPhone 5 can also take still photos while recording video. The camera on the iPhone 5 reportedly shows purple haze when the light source is just out of frame,  although Consumer Reports said it "is no more prone to purple hazing on photos shot into a bright light source than its predecessor or than several Android phones with fine cameras On all five model generations, the phone can be configured to bring up the camera app by quickly pressing the home key twice.
The iPhone 5S features True Tone Flash, which has two LED lights, white and amber, that will improve white balance and will be adjusted in 1, combinations. Its image sensor is now 15 percent larger than its previous model. Both models can shoot p videos at 60 frames per second. With the release of iOS 8 , the iPhone 4S and later models can now shoot time-lapse videos, with its capability to switch frame rates automatically as the recording increases its time. The front-facing camera is upgraded to 5 megapixels.
The user may change the resolution between 4K and p in Settings. The iPhone 7 features optical image stabilization on its rear camera, a feature that was previously exclusive to the Plus models, and the 7 Plus is the first iPhone to feature dual-lens cameras both 12 MP. Both models have a 7 MP front-facing camera. The iPhone 8 camera remains largely the same as its predecessor, but it features a larger sensor, and a newer color filter. The camera can also now record 4K at 60 and 24 frames per second, and slow-mo at p in frames per second.
The new camera system also enables Portrait Lighting, which defines the light in a scene.
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The XS series has telephoto lens, while the lower end XR has only one lens. The iPhone 11, 11 Pro and 11 Pro Max introduced an ultrawide lens; the latter two became the first triple-camera iPhones. The 11 has a dual-lens setup, lacking the telephoto lens of the 11 Pro and 11 Pro Max. The front camera is now capable of recording video at 4K as a result of a new 12 MP sensor, and can also capture slow-motion footage. The SIM sits in a tray, which is inserted into a slot at the top of the device. In the case of Verizon, for example, one can request that the SIM slot be unlocked for international use by calling their support number and requesting an international unlock if their account has been in good standing for the past 60 days.
All iPhones as well as many other devices by Apple have a small disc at the bottom of the headphone jack that changes from white to red on contact with water; the iPhone 3G and later models also have a similar indicator at the bottom of the dock connector. However, with the adoption of water resistance as a feature of the iPhone, this practice is no longer in use by Apple. The iPhone's indicators are more exposed than those in some mobile phones from other manufacturers, which carry them in a more protected location, such as beneath the battery behind a battery cover.
These indicators can be triggered during routine use, by an owner's sweat,  steam in a bathroom, and other light environmental moisture. All iPhone models include written documentation, and a dock connector to USB cable. The first generation and 3G iPhones also came with a cleaning cloth. The first generation iPhone includes a stereo headset earbuds and a microphone and a plastic dock to hold the unit upright while charging and syncing.
The iPhone 3G includes a similar headset plus a SIM eject tool the first generation model requires a paperclip. The iPhone 3GS includes the SIM eject tool and a revised headset, which adds volume buttons not functional with previous iPhone versions. The iPhone 3G and 3GS are compatible with the same dock, sold separately, but not the first generation model's dock.
In September , with the launch of the iPhone 6 , Apple announced Apple Pay , a mobile payment system.
The feature, aimed to "revolutionize" the way users pay, uses an NFC chip, Touch ID fingerprint scanner Face ID on iPhone X and later , Apple's Wallet app, and a dedicated "Secure Element" chip for encrypted payment information to make purchases at participating stores, both physical and online. All iPhone models have a haptic engine to vibrate when a notification or alert, incoming call, etc. The iPhone 4S uses a linear resonant actuator vibrator, which usually uses less power and creates a quieter vibration.
It is unsure as to why Apple decided to switch back. However, the iPhone 6 and 6 Plus uses a linear resonant actuator vibrator. The iPhone comes with a set of bundled applications developed by Apple,  and supports downloading third-party applications through the App Store.
How to Use Eye Tracking to Interact with Your iPhone
Apple provides free  updates to the operating system for the iPhone either wirelessly or through iTunes. The size of the operating system depends on version. While iOS 8 required over 4. The interface is based around the home screen, a graphical list of available applications. Starting with the iPhone 4, a primitive version of multitasking came into play. Users could double click the home button to select recently opened applications.
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Starting with iOS 7, though, apps can truly multitask, and each open application runs in the background when not in use, although most functionality is still available when making a call or listening to music. The home screen can be accessed by a hardware button below the screen on the iPhone 8 and earlier.
It is available on devices with an A9 chip or newer. Docked at the base of the screen, four icons for Phone , Mail , Safari Internet , and Music delineate the iPhone's main purposes. After the update, iPhone users can rearrange and place icons by holding down on any icon and moving it to the desired location once they start shaking on up to nine other adjacent home screens, accessed by a horizontal swipe. Users can also add and delete icons from the dock, which is the same on every home screen. The dock holds up to four icons, and is located at the bottom section of the screen.
Each home screen holds up to twenty icons for the first-generation iPhone , 3G , 4 and 4S ; The iPhone 5 , 5C , 5S , and SE hold up to twenty-four icons; while the iPhone 6 and later iPhone models support up to twenty-eight icons. Users can delete Web Clips and third-party applications at any time, and may select only certain applications for transfer from iTunes.
Apple's default programs, could only be removed since the iOS 10 update. Almost all input is given through the touch screen, which understands complex gestures using multi-touch. The iPhone's interaction techniques enable the user to move the content up or down by a touch-drag motion of the finger.
For example, zooming in and out of web pages and photos is done by placing two fingers on the screen and spreading them farther apart or bringing them closer together, a gesture known as " pinching ". Scrolling through a long list or menu is achieved by sliding a finger over the display from bottom to top, or vice versa to go back.
In either case, the list moves as if it is pasted on the outer surface of a wheel, slowly decelerating as if affected by friction. In this way, the interface simulates the physics of a real object. Unlike previous scrollable views, in which the user pressed a "down" control to move the view "downwards", on iOS the user pushes upwards , as if moving a "plank of wood floating on the water", creating the impression that the user is directly manipulating the content displayed on the screen.
Other user-centered interactive effects include horizontally sliding sub-selection, the vertically sliding keyboard and bookmarks menu, and widgets that turn around to allow settings to be configured on the other side. Menu bars are found at the top and bottom of the screen when necessary.
Their options vary by program, but always follow a consistent style motif.