All default 'Apple' icons disappeared on iPhone 7 I restarted my iPhone 7 today and all stock Apple apps have disappeared like Safari and Settings.  If I search for them they do not appear either.

I tried connecting my phone to iTunes and backing up and then doing a restore. But when I do this it tells me to turn off Find My iPhone.. Which I cannot do without the Settings app.

My phone is up to date with is 10. 

How can I get them back?
As long as you know the AppleID and password for the device, you can restore without needing to get to the settings app:


https://support.apple.com/en-us/HT201263


This option is needed for service and if you sell a device and forget to unlock it before it leaves your possession. When multiple apps are broken, a restore is almost always the fix and something you should try once you back up the device as best you can before the erase.