Area code 821 – South Carolina
821 has served South Carolina since 2024, split from 864. It is still largely empty: 42 of 786 number blocks allocated. AT&T is the largest holder with 57.1% of blocks, ahead of Onvoy / Inteliquent at 21.4%. It shares its geography with overlay codes 864, so local calls take all ten digits. Spam complaints are comparatively rare: 8 in the 33 days to 30 October 2026, 407th of the 422 codes with five or more complaints.
- State
- South Carolina
- In service since
- 2024
- Time zone
- Eastern
- Shares area with
- 864
Who holds 821 number blocks
Share of the 42 assigned NXX blocks (5.3% of the 786 possible), across 10 carriers. This is share of number blocks, not of subscribers.
- AT&T57.1%
- Onvoy21.4%
- Other CLEC / VoIP7.1%
- Charter4.8%
- T-Mobile4.8%
- TPx2.4%
- Verizon2.4%
Spam complaints naming 821
FTC Do Not Call complaints where the caller ID was a 821 number, 28 Sep – 30 Oct 2026 (33 days). Caller IDs on spam calls are frequently spoofed, so these are complaints about the code, not calls proven to originate in it.
Rate centers in 821
NANPA allocates number blocks to rate centers and records their names abbreviated to ten characters, so these are NANPA's codes rather than place names – CHAMPAURBN is Champaign-Urbana, NWYRCYZN01 is a New York City zone. We show them unchanged instead of guessing at the full names. Showing the largest 5 of 16.
Timeline
- 2024 821 goes into service, split from or overlaid on 864.
More about 821
Separate pages for the questions that need their own answer: what time it is there, what the complaint data says, who holds the number blocks, and how the code compares with the one it shares its area with.
Frequently asked about 821
What state is area code 821?
South Carolina. It covers the same area as 821/864.
Is a call from 821 a scam?
Not by itself. 821 drew 8 FTC complaints in the 33 days to 30 October 2026, 407th of 422 ranked codes – mid-pack or lower. Spam callers spoof caller IDs, so the only useful check is the full number.
Which carrier owns 821 numbers?
AT&T holds the largest share of assigned number blocks at 57.1%. The rest is spread across 3 other carriers. This is share of number blocks, not of subscribers – people keep their numbers when they switch carriers.
Do I need to dial 10 digits in 821?
Yes – ten digits for local calls in 821, because it shares its area with another code.
Sources and verification
- NANPA – NPA Database (npa_report.csv), file date 11/01/2026, retrieved Nov 1, 2026
- NANPA – CO Code Assignment Records, All States (utilized), file updated 11/01/2026, retrieved Nov 1, 2026
- FTC – Do Not Call Reported Calls Data, 25 daily files 28 Sep – 30 Oct 2026, retrieved Nov 1, 2026
NANPA dialing note for this code: “10D”. Reviewed by the data desk. Spotted an error? Request a correction.