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When I tap on the bottom of my iPhone's screen it actually acts as if I tapped in another section higher up. It may be a calibration problem. How can I recalibrate the touchscreen?

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what device is the touchscreen on? –  Rich Seller Jul 22 '10 at 15:28
    
@Rich I'd assume iPhone, that's what the question is tagged –  Kyle Cronin Jul 22 '10 at 15:33
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@Kyle clever clever –  Rich Seller Jul 22 '10 at 15:39

2 Answers 2

The iPhone's capacitive touch screen doesn't have the concept of calibration.

To fix the problem you're experiencing, I suggest trying each of the following options:

  1. Hard reset of the phone by holding the Home and Sleep buttons for 10 seconds.

  2. "Reset All Settings" from Settings → General → Reset.

  3. "Erase All Content and Settings" from Settings → General → Reset.

  4. If your phone is still under warranty or covered by AppleCare, bring it to Apple and they will repair or replace it for you.

  5. If not covered, then there are guides for replacing the front panel (first-gen iPhone), which contains the digitizer.

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I tried options 1. to 3. but none of them had any effect whatsoever. –  awe Sep 18 '13 at 11:53
    
I remember that I went through a calibration process the first time I set up the phone when it was new, but this process was not appearing when resetting everything (option 3.) –  awe Sep 18 '13 at 11:58

I just recently had this problem. After some panic, and consideration of replacing my digitizer, I calmed down and looked at my phone carefully.

Keep in mind that an iphone works on capacitance, with the glass plate being an insulating layer just on top of the sensing array.

On inspecting my phone, I discovered that the bottom right corner of the glass face(to the right of the home button holding the phone in portrait orientation)had become flush with the top of the chrome strip which runs so elegantly around my 3g. It's not supposed to be flush. The glass top on a 3g/gs should be slightly higher.

I powered down and removed my sim card, removed the screws at the bottom and re positioned the face properly.

Good news? I returned to proper working order. Bad news? it doesn't last. Most likely I will have to replace the digitizer.

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