If it makes you feel any better, all my phone cameras, whose lenses I make sure are protected and kept clean, show bad flare when taking into the light. There's nothing you can do about it.
In the past, it was worse. I have used old uncoated six-element wide-aperture standard lenses which were of the highest quality in their day, that sometimes flare so badly when taking directly into the light that you can hardly make out the subject.
Posted via Windows Phone Central App