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As the title describes, sometimes, but not too rarely, when I have an incoming call I cannot fully slide the lock to answer. It will get to like 20-30% and then jump at the start. Sometimes after many tries ill make it while other times i just lose the call. There seem to be lots of people with this issue but couldnt find an answer.

Problem happens on IPhone 4 with latest software running. This occurs with calls coming from contacts but 99% of incoming calls are from contacts anyway.

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This happens on my 3GS sometimes. I think it's just a software issue that we don't have any control over. You could always DFU restore the phone if you wanted to make 100% sure your OS is ok. – hellothere Aug 19 '12 at 23:00
I've had this. Whether they're a contact or not is irrelivent. I suspect (with absolutely no evidence) it's related to sweaty or dirty fingers leaving a receptive streak across the slide area. Rather than the phone seeing a fingertip move across the screen, it sees a finger grow across the screen much larger than a figertip should be. I quickly plugged in the hands-free and answered it with that. – Hand-E-Food Aug 20 '12 at 0:12
@Hand-E-Food the thing you mention cannot have anything to do with it although thanks for sharing your thoughts. – latusaki Aug 20 '12 at 13:27
@hellothere so you havent found a solution? – latusaki Aug 20 '12 at 13:28
Not for sure, I normally just clean my screen with isopropyl wipes and restart the phone – hellothere Aug 20 '12 at 21:14
up vote 2 down vote accepted

Almost a month after doing the reset, the issue has not appeared, so I believe this has been solved. Dirt on the screen did not apply on my case but I guess it can cause this issue in some cases.

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I had this problem many times. To solve it I had to reset my iPhone 3G settings. To do so just go to Settings / Reset / Reset All Settings. You will not lose any of your data.

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