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

OAK FOR SO prefixes in area code 708

NANPA records 10 assigned NXX blocks to rate center OAK FOR SO in area code 708, 1.3% of the 784 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. 7 holders hold those blocks, the largest being NEW CINGULAR WIRELESS PCS, LLC - IL (4), PAETEC ITEL, LLC (1), TELEPORT COMMUNICATIONS AMERICA, LLC - IL (1). The earliest assignment on record here is 2001-04-12 and the most recent 2021-01-11. 10 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 code 464 – overlay codes cover the same geography, so a rate center is served by all of them.

10 assigned blocks – 1.3% of 708
7 holders of record
10 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
708-321 Windstream PAETEC ITEL, LLC 2001-04-12 yes yes
708-381 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - IL – yes yes
708-382 Lumen LEVEL 3 COMMUNICATIONS, LLC - IL – yes yes
708-465 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL 2010-08-10 yes yes
708-518 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL 2012-01-13 yes yes
708-560 AT&T ILLINOIS BELL TEL CO – yes yes
708-578 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL 2015-06-12 yes yes
708-659 Onvoy ONVOY, LLC 2021-01-11 yes yes
708-803 Peerless PEERLESS NETWORK OF ILLINOIS, LLC - IL 2013-04-10 yes yes
708-941 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL 2009-04-21 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
NEW CINGULAR WIRELESS PCS, LLC - IL AT&T 4 40%
PAETEC ITEL, LLC Windstream 1 10%
TELEPORT COMMUNICATIONS AMERICA, LLC - IL AT&T 1 10%
LEVEL 3 COMMUNICATIONS, LLC - IL Lumen 1 10%
ILLINOIS BELL TEL CO AT&T 1 10%
ONVOY, LLC Onvoy 1 10%
PEERLESS NETWORK OF ILLINOIS, LLC - IL Peerless 1 10%

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 OAK FOR SO in area code 708?

10 blocks: 321, 381, 382, 465, 518, 560, 578, 659, 803, 941. The table above gives the holder of each.

Which carriers have numbers in OAK FOR SO?

NEW CINGULAR WIRELESS PCS, LLC - IL (4 blocks), PAETEC ITEL, LLC (1 block), TELEPORT COMMUNICATIONS AMERICA, LLC - IL (1 block), LEVEL 3 COMMUNICATIONS, LLC - IL (1 block), ILLINOIS BELL TEL CO (1 block), ONVOY, LLC (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is OAK FOR SO 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 708

All 784 prefixes in 708