We've just increased the number of characters a patient's phone field from 20 to 100.
Now, if you want to include a short note in the phone field to remind you the number is for the parent, or partner, or the patient's Mailman, you can do so! This change by itself won't affect any existing phone numbers.
EDIT: Unfortunately, this functionality has had to be reverted. We are looking at a better way to handle the need to apply a short note to the phone field, and we're looking at plenty of options for that.