How does iphone recognize fingers

You can use a Q-tip and a small amount of alcohol to clean it. Your iPhone will now wipe all data and reset back to factory defaults. When completed, you will be presented with the Welcome screen you saw when you took your iPhone out of the box for the first time. Get Tech Support See How it Works video.

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Slide to power off when prompted. Some screens rely on system-wide averages to determine touch locations. Some systems take measurements by first establishing a baseline. When you touch the screen, you create a new baseline. Adding another touch causes the system to take a measurement using the wrong baseline as a starting point.

The Apple iPhone is different -- many of the elements of its multi-touch user interface require you to touch multiple points on the screen simultaneously. For example, you can zoom in to Web pages or pictures by placing your thumb and finger on the screen and spreading them apart. To zoom back out, you can pinch your thumb and finger together. The iPhone's touch screen is able to respond to both touch points and their movements simultaneously. We'll look at exactly how the iPhone does this in the next section.

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You may unsubscribe at any time. By signing up, you agree to receive the selected newsletter s which you may unsubscribe from at any time. You also agree to the Terms of Use and acknowledge the data collection and usage practices outlined in our Privacy Policy. Here's a quick and simple way to improve the accuracy and reliability of Touch ID. Make sure that your fingers and the Touch ID sensor are clean and dry. Your finger should cover the Touch ID sensor completely, touching the surrounding metal ring.

While Touch ID is scanning, you shouldn't tap too quickly or move your finger around. If you're using a case or screen protector, make sure it doesn't cover the Touch ID sensor or the surrounding ring.