Tangentially related, when websites mess up the digit grouping in phone number input fields, I've noticed it becomes quite hard to read. Must be a headache to get it right though, because it's a convention that changes from country to country, but it's easily worse than not grouping the digits.
Not that it's always right, but Google's libphonenumber has formatting rules for phone numbers that work pretty well. But you need to know the right country, which isn't always easy; people may enter a local number and the site context isn't always enough to know what country is implied.
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Tangentially related, when websites mess up the digit grouping in phone number input fields, I've noticed it becomes quite hard to read. Must be a headache to get it right though, because it's a convention that changes from country to country, but it's easily worse than not grouping the digits.
Not that it's always right, but Google's libphonenumber has formatting rules for phone numbers that work pretty well. But you need to know the right country, which isn't always easy; people may enter a local number and the site context isn't always enough to know what country is implied.