Default country settings in contact scrapers silently corrupt phone number data

A developer analysis published on DEV Community found that using a 'defaultCountry' setting in contact scrapers causes structurally valid but factually wrong phone numbers to be stored in databases. A test crawl of IBM's contact pages on August 28, 2026, returned 52 phone strings lacking country codes, of which 18 passed as valid US numbers when parsed with a US default — including a Budapest number misidentified as a Texas area code. The core problem is that corporate contact pages are inherently international, making any single-country assumption unreliable from the outset. The author recommends storing unresolved numbers as raw local strings rather than forcing a country code, allowing downstream systems with proper geographic context to resolve them accurately. The key principle proposed is never to synthesise a country code when the source page does not explicitly provide one.