https://forums.macrumors.com/attachment.php?attachmentid=238500&stc=1&thumb=1&d=1278967512
The left
You get your serial number in settings---about.
post the first 3 digits
Yes..my exact case. The screen is not yellow at all when your using it alone. But I've used a blue tinted 4 since June 2010. My 3G and 3GS were blue too. Thats over 3 years of blue tinted screen.