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

SUNDANCE prefixes in area code 307

NANPA records 5 assigned NXX blocks to rate center SUNDANCE in area code 307, 1.0% of the 499 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 4 holders hold those blocks, the largest being CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY (2), RANGE TEL COOP INC (1), NEW CINGULAR WIRELESS PCS, LLC (1). The earliest assignment on record here is 2003-12-18 and the most recent 2003-12-18. 3 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

5 assigned blocks – 1% of 307
4 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
307-281 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY – yes yes
307-282 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY – yes yes
307-283 RANGE TEL COOP INC – no yes
307-290 AT&T NEW CINGULAR WIRELESS PCS, LLC – yes yes
307-790 UNION TELEPHONE COMPANY 2003-12-18 no yes

The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.

Who holds the blocks

HolderBrandBlocksShare here
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY Verizon 2 40%
RANGE TEL COOP INC – 1 20%
NEW CINGULAR WIRELESS PCS, LLC AT&T 1 20%
UNION TELEPHONE COMPANY – 1 20%

Frequently asked

Which prefixes belong to SUNDANCE in area code 307?

5 blocks: 281, 282, 283, 290, 790. The table above gives the holder of each.

Which carriers have numbers in SUNDANCE?

CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY (2 blocks), RANGE TEL COOP INC (1 block), NEW CINGULAR WIRELESS PCS, LLC (1 block), UNION TELEPHONE COMPANY (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is SUNDANCE a city?

It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.

Other rate centers in 307

All 499 prefixes in 307