I noticed that many apps were crashing instantly on launch with a new iPhone 7 Plus.
It turns out the issue likely relates to the App Store Terms & Conditions, which if they have changed and you have not accepted them, seems to prevent downloaded apps from opening at all and instead the apps crash immediately on opening.
Fortunately the fix is super easy. Open the App Store, download any new app, agree to the new Terms & Conditions, and all apps on the iPhone should work fine without quitting themselves on launch.
Some new devices may have a software update to install as well, be sure you do that if it applies to your device. You can read the accompanying article here:
And as always, find the best Apple tips around at http://osxdaily.com