Southwestern Bell is AT&T's local phone company in Texas, Oklahoma, Kansas, Missouri and Arkansas.
Southwestern Bell was the Bell phone company for Texas, Oklahoma, Kansas, Missouri and Arkansas. Its parent company, SBC, bought AT&T Corp. in 2005 and took the AT&T name, so Southwestern Bell is AT&T's local phone company in those states. NANPA, which runs the North American numbering plan, lists Southwestern Bell as the holder of 6,013 prefixes in 6 states and territories, 3% of the 198,436 prefixes it has assigned.
- Name in NANPA's file
- SOUTHWESTERN BELL, and 2 other listings
- What it is
- AT&T's landline company
- Prefixes held
- 6,013 of 198,436 (3%)
- States and territories
- 6 of 56, most in Texas, Missouri and Oklahoma
- Area codes
- 43
- Pooled prefixes
- 59%, shared in blocks of 1,000 numbers
From NANPA's central office code file of October 1, 2026. A prefix is the three digits after the area code.
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A lookup shows Southwestern Bell when the number is a line on AT&T's local phone network.
These are landlines and business lines that AT&T runs under the Southwestern Bell name in that area, which is why the lookup does not just say AT&T.
Numbers can also move between carriers, so a lookup reads the number's carrier today, and a number with a Southwestern Bell prefix can show another company if it was ported.
Southwestern Bell holds the most prefixes in Texas: 3,563 of its 6,013.
- Texas3,563
- Missouri849
- Oklahoma625
- Kansas567
- Arkansas407
- Illinois2
Southwestern Bell holds prefixes in 43 area codes, and these are its largest.
- Area code 713470 prefixes
- Area code 972323 prefixes
- Area code 817301 prefixes
- Area code 281283 prefixes
- Area code 214282 prefixes
- Area code 210280 prefixes
- Area code 512272 prefixes
- Area code 314252 prefixes
- Area code 405237 prefixes
- Area code 918233 prefixes
- Area code 816220 prefixes
- Area code 913163 prefixes
A call from a Southwestern Bell number is not spam just because of the carrier.
Southwestern Bell lines belong to homes, offices and public services, so the carrier name says nothing about who is calling.
Caller ID can also be faked, so judge the call by what the caller asks for, never by the carrier name.
Check the full number with our free spam phone checker before you call back.
These are the questions people ask about Southwestern Bell.
What is Southwestern Bell?
Southwestern Bell was the Bell phone company for Texas, Oklahoma, Kansas, Missouri and Arkansas. Its parent company, SBC, bought AT&T Corp. in 2005 and took the AT&T name, so Southwestern Bell is AT&T's local phone company in those states.
Why does a phone lookup say Southwestern Bell?
A lookup shows Southwestern Bell when the number is a line on AT&T's local phone network. These are landlines and business lines that AT&T runs under the Southwestern Bell name in that area, which is why the lookup does not just say AT&T. Numbers can also move between carriers, so a lookup reads the number's carrier today, and a number with a Southwestern Bell prefix can show another company if it was ported.
Is a call from a Southwestern Bell number spam?
Southwestern Bell lines belong to homes, offices and public services, so the carrier name says nothing about who is calling. Caller ID can also be faked, so judge the call by what the caller asks for, never by the carrier name. Check the full number with our free spam phone checker before you call back.
How many phone prefixes does Southwestern Bell hold?
NANPA lists Southwestern Bell as the holder of 6,013 prefixes, 3% of all assigned US prefixes. A prefix is the three digits after the area code and covers up to 10,000 numbers. 59% of these are pooled, so blocks of 1,000 numbers inside them can belong to other carriers.
Which states have the most Southwestern Bell prefixes?
Texas (3,563), Missouri (849) and Oklahoma (625) have the most, out of 6 states and territories.
Can I find out who owns a Southwestern Bell number?
Southwestern Bell does not publish who uses its numbers. Our free who called me lookup shows who a US number is listed to and the city and state on the listing, when the number has a listing.
Source: NANPA, the North American Numbering Plan Administrator: its central office code assignments, as of October 1, 2026. Company histories are from public records and each company's own descriptions.