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

SULPHURSPG prefixes in area code 903

NANPA records 13 assigned NXX blocks to rate center SULPHURSPG in area code 903, 1.7% of the 771 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. 8 holders hold those blocks, the largest being FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (4), NEW CINGULAR WIRELESS PCS, LLC - IL (2), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX (2). The earliest assignment on record here is 2001-02-20 and the most recent 2014-01-29. 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 codes 430, 479 – overlay codes cover the same geography, so a rate center is served by all of them.

13 assigned blocks – 1.7% of 903
8 holders of record
10 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
903-243 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL – yes yes
903-307 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL 2011-10-24 yes yes
903-335 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 2001-02-20 yes yes
903-348 T-Mobile METROPCS, INC. – yes yes
903-438 Frontier FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS – yes yes
903-439 Frontier FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS – yes yes
903-440 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 2005-03-16 no yes
903-550 MATRIX TELECOM, LLC. S/I/I TNCI - TX 2008-09-24 no yes
903-558 PEOPLES COMMUNICATION, INC. -TX 2013-11-06 yes yes
903-689 Lumen LEVEL 3 COMMUNICATIONS, LLC - TX 2001-05-07 yes yes
903-885 Frontier FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS – no yes
903-919 CSC VOICE, LLC 2014-01-29 yes yes
903-951 Frontier FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 2001-05-01 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
FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS Frontier 4 30.8%
NEW CINGULAR WIRELESS PCS, LLC - IL AT&T 2 15.4%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX Verizon 2 15.4%
METROPCS, INC. T-Mobile 1 7.7%
MATRIX TELECOM, LLC. S/I/I TNCI - TX – 1 7.7%
PEOPLES COMMUNICATION, INC. -TX – 1 7.7%
LEVEL 3 COMMUNICATIONS, LLC - TX Lumen 1 7.7%
CSC VOICE, LLC – 1 7.7%

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 SULPHURSPG in area code 903?

13 blocks: 243, 307, 335, 348, 438, 439, 440, 550, 558, 689, 885, 919 and 1 more, all listed in the table above.

Which carriers have numbers in SULPHURSPG?

FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (4 blocks), NEW CINGULAR WIRELESS PCS, LLC - IL (2 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX (2 blocks), METROPCS, INC. (1 block), MATRIX TELECOM, LLC. S/I/I TNCI - TX (1 block), PEOPLES COMMUNICATION, INC. -TX (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is SULPHURSPG 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 903

All 771 prefixes in 903