Apple iPhone 4 is being dubbed as one of the most powerful smartphones with its internal A4 ARM Cortex-A8 processor but before its official launch, there are already some negative news with related to its Retina Display which exhibits yellowish spots. If you remember, this is not the first time Apple’s products being affected by display issue and similar symptom has also been observed during its iMac launching earlier this year.

According to reliable source, the yellowish phenomenon are quite random and can appear anywhere as small spots or even yellow lines across the high resolution screen. But interestingly, some do confirm that the phenomenon could go away by itself after a short period of usage. An online forum user even pointed out that it could potentially be due to bonding agent (named as Organofunctional Silane Z-6011) that be applied to bond the different layers of the glass, and the root cause is blamed to manufacturer that needs to rush for shipment before the evaporation process is fully completed. That is not all, another problem related to its signal strength was discovered as and when the users realized that the way of holding iPhone may affect its signal stability. Apple encourages iPhone 4 users to only hold the phone in certain way.

Nevertheless, the Cupertino-based company has not acknowledged with any feedback but hopefully all these issues will get rectified before more phone been released to the public.

Update: Apple is giving away free Bumper case for iPhone 4 to fix the antenna touching drop reception issue.