[mpicker0]

Not pictured but also terrible:

Enter your phone number in these three separate fields. We may or may not automatically take you to the next field when you've entered enough digits in this one.

Enter your phone number in this specific format (which may be: with dashes, with dashes/parentheses, without any punctuation, some other crazy thing). We can't simply extract the numbers on our end; that's unbelievably difficult.

Pick your area code from this dropdown.

[subliminalpanda]

It's surprising how many websites (mis)handle internationalized phone numbers, or insist on an area code when there is none.

[norea-armozel]

Yeah I always wished for people to just give one text box for the number and a dropdown for the country of origin. I never understood the need to represent phone numbers as US only format(s) in the input.