Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records

Area code 316 prefixes

341 of the 786 possible NXX blocks are assigned in area code 316 (43.4% of capacity), spread across 14 rate centers and 41 holders. The largest holders are SOUTHWESTERN BELL (114 blocks, 33.4%), NEW CINGULAR WIRELESS PCS, LLC - IL (37 blocks, 10.9%), T-MOBILE USA, INC. (29 blocks, 8.5%). Grouped by brand, AT&T accounts for 159 blocks; brand-attributable holders cover 92% of the code, and the rest are CLECs, VoIP wholesalers and regional carriers that trade under their own names. The assignment records here run from 2001-03-05 to 2026-10-06, with 17 blocks handed out in 2021 alone. 264 blocks (77%) are in thousands-block pooling, meaning the block is shared between carriers in 1,000-number lots rather than held whole – which is why a single NXX can serve several carriers at once. 3 assigned blocks (271, 273, 446) are not yet in service: assigned to a carrier but not open for calls, so a caller ID from one is spoofed. 59 were growth assignments – additional blocks to a carrier that had already filled its earlier ones.