I have iPhone 7 plus and I have upgraded to version 13.1 but all my contacts info has disappeared. My contacts are still on cloud, but the problem is with the sync between my device and my cloud.
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Here's a fix for disappearing contacts in iOS 13.1 on iPhone 7 plus:
It turns out the issue isn't with iCloud, it's with a new default in iOS 13.1.
Now wait for ~1 minute and your contacts will appear again in your phone.
Probably the problem is in the sync functions for the first run.