Correcting wide angle photos from iPhone 6 on iOS

Solution 1:

You may wish to try SKRWT for iOS.

From an article from PhotoApps.Expert:

If you've ever shot a photo of a tall building from the ground, you know when you tilt up at it, the perspective goes wonky and your beautiful square building starts to look like the pyramids of Egypt.

SKRWT by mjagielski [$1.99 on the App Store] is an app that makes correcting that perspective distortion extremely simple. Not only does it do keystone correction, but it can also fix wide angle lens distortion.

I tested it with a snapshot of Minneapolis. (I didn't spend a lot of time on this. Just to test.)