New i phone cant download apps

Here are some simple solutions you can try.

1. Go to check your internet connection.
2. Sign out and Sign in to the App Store
3. Check your Apple ID payment methods
4. Disable Restrictions for Installing Apps
5. Allow App Store purchases in Content & Privacy Restrictions

If it still doesn't work, try some Apple's native solutions: If you can’t download or update apps on your iPhone or iPad - Apple Support

Welcome to the Apple Support Communities.

See: If you can’t download or update apps on your iPhone or iPad - Apple Support.

Jack