Iphone screen problems

One of the iPhone's greatest features is its highly intuitive touch screen.
Unlike other electronic device touch screens, your iPhone doesn't operate using the blockage of light to decipher which keys and commands you're pressing.
This makes it a viable choice for cell phone users who may not be able to complete other types of commands.
While you cannot alter the sensitivity of your iPhone, you can toggle certain features that make your phone easier to use.
How It Works

The key to understanding the sensitivity level of your iPhone's touch screen is first understanding how the touch screen actually works.
Instead of detecting light blockages or heat to interpret your finger's movements, the iPhone actually has a grid that lies underneath the surface of the touch screen.
When your finger touches the screen, electrical impulses detect the area on the grid that you're touching to interpret the letter, command or motion you're making to issue the correct response.
Screen Sensitivity
While previous models of the iPhone did offer the ability to change the screen sensitivity and the speed by which your phone responds to commands, the iPhones 4 and 4S no longer offer the option.
Instead, the touch sensitivity on newer phones is automatically calibrated for the fastest speeds, which means your phone responds quickly to your touch.
If this frustrates you and results in commands and calls you didn't mean to make, locking the screen by pressing the button on the top right-hand rim of the phone helps stop unwanted commands.
Assistive Touch
Update iPhones running on iOS 5 with an option known as "AssistiveTouch," which allows users who may not have complete control over their bodies and motions to use the iPhone.
This program allows you to change the speed at which the phone responds to your touch.
By tapping the "General" icon, then touching "Accessibility" and "AssistiveTouch," you'll enter the assistive touch menu.
When you turn on the option, an overlay appears on the screen that allows you to give commands by touch, rather than by shaking, swiping or pinching the screen.

When setting up AssistiveTouch, you'll have the opportunity to select your command tracking speed, which deals with how sensitive your iPhone is to your various gestures and custom commands.
Case Issues
Your touch screen isn't the only place where your phone is sensitive to movements.
Your iPhone has a feature called a proximity sensor.
The role of the proximity sensor is to sense the closeness of your face during a phone call. When the phone senses that your face is close to the phone, it locks your screen to prevent you from accidentally activating the touch screen with your cheek or ear.
This is handy, except when the proximity sensor is partially obscured by a case and is no longer sensitive to the position of your face.
The proximity sensor is found on the upper right-hand corner of your screen, so ensure that it remains uncovered to preserve its sensitivity.

http://www.gadgetvenue.com/how-the-iphone-touch-screen-works-02223447/


http://www.appleinsider.com/articles/11/07/11/inside_apples_ios_5_assistive_touch_allows_accessible_gesture_commands/

if part of your screen isnt responding to touch then it could be either software or hardware related, best thing to do it back everything up via itunes and if jailbroken cydia stuff through aptbackup, then do a restore in itunes (if jailbroken shift+restore for custom firmware)
Then once it has finished see if this has corrected the problem.

If not, then you have a fault with your digitizer. This is basically a film behind the glass of the screen which tells the iphone where you fingers are etc.
You can buy a new digitizer pretty cheap from ebay, just look up a guide on how to install it (you can keep your exisiting LCD) and this will fix the problem.

Sorry but your touch screen needs replacement. Take it to the apple store and see if they'll give you a replacement. If they don't there are third party iPhone Repair Services that can fix it for you. There are also free iPhone Repair guide that show you how to fix it yourself.

Try restarting the phone, without home button you will not be able use any application.

Your device might have a problem in the touch screen.

In iPhone 2G the touch panel and the LCD screen are one unit that cannot be separated.

You shoud try to replace the iPhone screen with a new one and the problem should be fixed.

CHECK OUT HOW TO REPLACE THE IPHONE SCREEN!!!

Have you tried doing a hard shut down? Hold the silver button down on the upper right corner and also the home button (center,bottom indented button) together for about 10 seconds. the phone will completly shut off. then wait about 10 seconds and hold down the upper right hand button until the apple appears on the phone then release the button and wait (20-30seconds) . Doing this usually solves all my issues with my iphone when it gets locked up like this.

try to restore your iphone using itunes,if that didnt work,you need a replacement LCD,that is a common problem especially when you dropped it

I have the exact problem! I guess there is really no other fix than to replace the touch screen. The problem is, its not officially release in Asia yet, although there might be some other service centers who may have parts for iphone, be careful where you have it fixed, some parts may be replaced with damaged ones.

Hi,
I have the same problem my iphone dose not work frome uppers please inform me what can i do?

Thanks,
Ibrahim