Is this on every image? If so, is there anything on the lenses?
As to the secondary issue, this may not be an option for you, but if you have room on a credit card for them to place a hold for the amount of the phone they have an option where they will send you a replacement phone and a box to ship yours back to them. The hold will stay on your card until they receive your phone back. I have done this several times because I do not want to be without my phone while waiting for repairs either. They do not charge your card unless they do not receive your phone. I believe it is called an expedited repair and you have to ask for it.
