Can't place WhatsApp calls as I'm told my phone number is no longer registered For the past several days, I can't make WhatsApp calls. When I try, I get a message saying:


  Can't place call because this number is no longer registered on WhatsApp


So, I go to my account settings, and in "Two step Verification" it says:


  For added security, enable two-step verification, which will require a PIN when registering your phone number with WhatsApp again.


So I guess I need to re-register my phone. But how? If I try "change number", it won't accept the same number, it has to be a different one. Except I don't have a different number to use. And I definitely do not want to delete my account...

What do I do?

Relevant Details:
Phone: Xiaomi Redmi 3S
Android version: 6.0.1 (MIUI build 8.5.4.0)
WhatsApp version: 2.17.427
In the message:

Can't place call because this number is no longer registered on WhatsApp

the word &quot;this&quot; means &quot;the number you're trying to call&quot;, not &quot;your own number&quot;.
Calling other numbers will work.
A belated thanks goes to @aBochur for drawing my attention in this direction.