 On September 21, 2000, the NANPA split off most of southern Kansas and gave it the new 620 area code, which now completely surrounds 316, making it one of the six pairs of doughnut area codes in the numbering plan.Between February 3 and November 2, 2001, numbers in the affected area could be dialed using 316 or 620, where after when the use of 620 became mandatory.Even with the continued proliferation of cell phones and pagers, 316 is nowhere near exhaustion.