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

HELENA prefixes in area code 870

NANPA records 9 assigned NXX blocks to rate center HELENA in area code 870, 1.1% of the 785 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. 5 holders hold those blocks, the largest being SOUTHWESTERN BELL (5), LEVEL 3 COMMUNICATIONS, LLC - AR (1), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR (1). The earliest assignment on record here is 2001-05-08 and the most recent 2024-02-28. 8 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area codes 406, 419, 567, 580 – overlay codes cover the same geography, so a rate center is served by all of them.

9 assigned blocks – 1.1% of 870
5 holders of record
8 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
870-228 Lumen LEVEL 3 COMMUNICATIONS, LLC - AR 2001-05-08 yes yes
870-338 AT&T SOUTHWESTERN BELL – yes yes
870-572 AT&T SOUTHWESTERN BELL – yes yes
870-714 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 2006-01-13 yes yes
870-753 AT&T SOUTHWESTERN BELL – yes yes
870-816 AT&T SOUTHWESTERN BELL – yes yes
870-817 AT&T SOUTHWESTERN BELL – no yes
870-963 IP HORIZON LLC 2024-02-28 yes yes
870-995 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL – yes 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
SOUTHWESTERN BELL AT&T 5 55.6%
LEVEL 3 COMMUNICATIONS, LLC - AR Lumen 1 11.1%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR Verizon 1 11.1%
IP HORIZON LLC – 1 11.1%
NEW CINGULAR WIRELESS PCS, LLC - IL AT&T 1 11.1%

Same rate center in other codes

Overlay codes cover the same geography, so one rate center is served by all of them.

Frequently asked

Which prefixes belong to HELENA in area code 870?

9 blocks: 228, 338, 572, 714, 753, 816, 817, 963, 995. The table above gives the holder of each.

Which carriers have numbers in HELENA?

SOUTHWESTERN BELL (5 blocks), LEVEL 3 COMMUNICATIONS, LLC - AR (1 block), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR (1 block), IP HORIZON LLC (1 block), NEW CINGULAR WIRELESS PCS, LLC - IL (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is HELENA 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 870

All 785 prefixes in 870