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A system I worked on used the RDBMS’ default of 50 characters in a varchar column and the validation regex allowed uppercase alphanumeric input (for “1-800-CONTACTS”-style numbers) and also allowed spaces in addition to dashes. But the system didn’t allow users to label numbers in a separate field - so the users put the labels at the end of each number, e.g. “425-123-7890 JOHN SMITH, HOME”.

The system used this value for generating tel: links in webpages - which meant the links wouldn’t work anymore - but users preferred keeping these custom labels to having Skype-integrated or iOS tappable links anyway.

/csb




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