one of these days i need to read up on how capacitive touch screens really work. for some reason, i can swipe my phone's touch screen with the corner of my Kindle, but it only works reliably on the middlest part of the screen, not the edges.
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@2ck Oh I left out the most important part. There is also a constant voltage applied around the border of the screen. This is obviously needed to allow the capacitance to be detected (your body is interacting with the electric field to become the other plate of the capactor.
dope. thanks, @freemo
This is Mur 
@2ck @freemo
My phone has a strange case of touchscreen glich where it doesn't detects my touch until I press my finger very very hard on the screen though this problem is easily solved by just locking and unlocking the phone 
After going through this problem for 3 years the most plausible answer seems to be static electric charges getting collected on the screws inside probably.
@freemo
That's a good point. Actually many phones reset their screens apparent capacitive threshold (the limit where it differentiate between an actual touch and just atmospheric charges and stuffs) when unlocked or locked. This same effect is also achieved by resetting and testing the screen through Android's built in test system.
@2ck
@2ck its actually really simple, its just a gird of tiny plates under the screen and their capcitance is constantly tested, when a change is detected it is seen as a touch.
your phone is likely creating capacitance but on the fringe of what the sensors will register. Because when your near the edge you arent surrounding the touch point with sensors on all sides like you might in the middle it has a lower sensitivity and your touch event is therefore falling out of range.