A week ago I just moved from T-Mobile to Visible by Verizon and that's why I stopped having access to Cellular Data AND now I can't import my contacts.
Visible has done everything on their end to reset the Network Settings and I can talk, text, surf the web.
I just can't be on a Zoom call on WiFi OR off of WiFi.
I'm getting the same result, too, with trying to import my phone numbers.
I even verified my number in my Zoom account - same result as the screenshot above.
The CAPTCHA you see is NOT the same CAPTCHA you hear audibly when you click the speaker ICON and they definitely do NOT match the phone number you have to enter into the system.
I recently changed from T-Mobile SIM card to Visible by Verizon eSIM card.
My iPhone 11 has the capability of using either type of SIM card.