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if sliding your finger across the "slide to unlock" bar won't unlock your iPhone it's possible that your touch screen is (partially) broken.
Try a reboot first: Hold the Power-Button until the "Power off" slider appears. Hopefully you can slide that. If not hold Power and Home-Button for approx. 10 seconds until the phone is off.
If after starting your phone again you can't "slide to unlock" you should see to get a screen replacement.
There is nothing wrong with your screen, the problem is
from the flex that connects your screen to the phone's main board. This
flex must have worn out that's why your screen is not displaying any
The problem is common with flip and slide phones. The
flex gets worn out as a result of constant opening and close of the
flip or slide phone.
I would urge you to replace the flex and I
am assuring you that your screen will display picture again. You might
also be lucky to find out that the flex is not well fix, that is, it
may have loosed contact.
If you cannot change the flex yourself,
maybe you should take the phone to a local repairer within your
vicinity, so that the flex can be fixed/replaced.
You can also unlock it on the side by sliding little slide know down. I have LG Vojager and this always works for me. If the phone opens to the left it will be on left side towards top of the phone. It is the top most button. Hope this helps.
THIS WORKED FOR US: Hold down the power button until you see the "CANCEL" icon; tap around the screen until the "CANCEL" button turns blue - this will take you back to the slide feature. MAKE NOTE OF WHERE THIS SPOT IS ON THE SCREEN. Repeat the "cancel-screentap" process to find a 2nd spot in another area of the screen. While on the "slide" screen, draw a line between the 2 spots; when you return again to the "slide" screen, the "slide" should work. ONCE YOU HAVE OPENED THE PHONE do 2 things:
RECALIBRATE the screen
LENGTHEN the screen saver time-out to something other than the shortest time available.
Hope this works for you - GOOD LUCK! PS - dunderground posted the following solution in Apr 2009: "The fastest way is to be on the slide-lock screen & hold the side volume button in the Up position until "Press volume down key to check" comes up onscreen. This may or may not work on all firmware versions on the current i9, but works on most. Make sure to hold the button firmly in the Up position. You will first see the normal volume speaker icon show onscreen and the volume rise, but just keep holding it Up, and eventually you should see the pop-up box noted earlier. The moment you see that pop up onscreen, immediately press the side volume button in the down position. A white calibration screen should now show & you can calibrate the touch screen using the stylus."