The new auto-formatting and validation feature for phone numbers is a step in the right direction.
However, the current integration seems to be missing the mark with regard to user experience. I was unable to find any articles or posts in the Help Center announcing the new auto-formatting feature. The only Knowlege Base article that pops up when searching "phone number validation" is a detailed breakdown of editing default contact properties, and then there is only a reference to the validation and formatting being applied "automatically by Hubspot based on the country code."
This feature is certainly a step in the right direction, but several improvements are needed to improve the user experience and make the feature more functional overall (noting that recent comments on an "old" idea thread are already being discussed here; skip to page 7).
Suggested improvements include:
Default behavior of phone number formatting & validation when creating a new contact:
There are likely other enhancements that other users, especially those not based in the US, would appreciate.