I had the same issue with my ATT iphone 4 a few months ago. if you look at a white background screen (calendar for example), the whole screen looks yellowish.
it is a warm color factory setting that you can't change. Nothing to do with glue. my first Dell XPS 15 has this yellowish/reddish screen, which I can adjust using window color alignment.
Don't take it to apple store to change it. I did and it was a mess. first they give you a non-retail (possible refurb) black-box replacement. I tried 3 phones and they were worse, compared to 6 demo phones on the table. Apple don't let me try more phones. I was very upset walking out of apple store with a yellowish screen.
if you can bring it to Verizon and see if they can exchange for a brand new one. I did threaten to cancel ATT acct, they finally give me a retail-box one. fortunately, it was a good one, white screen looks white.
or return it and wait for Bestbuy. you can return to Bestbuy and exchange for a retail-box one if you don't like it.