Many iPhone 4 users are claiming that they are finding a small yellow spot on the display screen and this is looking odd, something like the device has got bad and they are planning for a replacement. It looks like a slight bumpy area where the display shows up a yellow tint which when pressed does not change anything and when viewed from a different angle has a mirror distortion. Even though the issue is something which is very small but anyone who is paying around 500-800$ for a device which is claimed to be the best for Retina display should not be having these kind of issues.
Many users contacted the Apple Support and other known websites to find out a solution and have come to know that this is actually a issue because of Organofunctional Silane Z-6011 which is a bonding agent used to bond different layers of glass on the display screen. This does not mean that Apple performs this stuff but may be the companies like Foxconn which manufacture the device would have quickly packaged the iPhone in order to meet the demand and make sure that they don’t cross the deadline for shipping the same.
According to the Apple Store Genius Technicians there is some amount of residue left which would automatically dry up in a few days. This means that you just need to ignore this stuff and within 3-4 days of full usage the display screen would get slightly heated up and dry up to make sure that the yellow discoloration on the device screen is automatically gone. Don’t worry you wont have to Replace iPhone Screen right away seeing this issue because if the issue persists you can opt for iPhone Replacement completely.