hah...i also facing the same problem some times... by using my left hand, but when i using my right hand it work just fine. i do let my friend try, and i found... the screen is only sensitive to heat... so i still recommend u make ur little finger hot 1st only try to type.
regarding the screen protector, it depend on what price u bough it. my one is made in japan, so no problem at all. bough it at RM49.00 at apple store. damn expensive.

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Added on June 11, 2008, 10:56 pmbut have u try format the iphone OS?
maybe restore will help too... try find the specialist in lowyat, if can't find just pm me, i will introduce a super specialist for u. bye fren

This post has been edited by maxtor1: Jun 11 2008, 10:56 PM