The iPhone 4's ability to detect the user's face as they hold the smartphone to their ear to receive a call is inferior to that of the previous generation 3G S model, according to an independent study.
This issue is caused by a proximity sensor which experts deem to be less sensitive than in previous models and the result is that users can accidentally make onscreen inputs when the skin comes in contact with the iPhone 4's display.
The iPhone 4's proximity sensor is nearly 30 per cent less sensitive than that of the 3G S, according to a report from consumer testing group Which?
In lab test, the iPhone 3G S was able to detect the approach of the subject and lock the screen when it was 55mm away. Meanwhile the iPhone 4 only performed the same action when the subject was 40mm away, which in this particular area is a significant difference.
The delay between the sensor picking up an approaching subject and then deactivating the touchscreen also differed between the two iPhones. The iPhone 3G S was half a second quicker than the iPhone 4.
The researchers are suggesting that Apple needs to update the iPhone 4's software in order to rectify these sensitivity problems and further tests are being carried out in order to look for other flaws.
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