As a result, Oakland County received the new area code 248, with a start of permissive dialing on May 10, 1997. Thus, the Oakland County numbering plan area was surrounded on three sides by area code 810, with 313 to the south.
Following this development, Oakland County adopted the new area code 248, with permissive dialing starting on May 10, 1997. The Oakland County numbering plan area was surrounded by area code 810 on three sides and 313 to the south.