Area code 267 is an overlay for area code 215, covering Philadelphia and its immediate suburbs. It was introduced in 1999 as the city’s demand for phone numbers grew, particularly with the rise of cell phones and digital communications. Ten-digit dialing became mandatory, and 267 is now common for new mobile and business lines in the area. While 215 holds historical value, 267 is fully integrated into the city's infrastructure. It supports Philadelphia’s dense population and vibrant economic activity, especially in tech, healthcare, and education.