839 Area CodeColumbia, SC
Area code 839 covers Columbia and nearby communities in South Carolina, in the Eastern Time (ET) zone, home to about 1,747,102 people across 161 cities. It was added in 2020 as an overlay of 803, so the same region uses both codes and every local call needs all ten digits.
Overview
- Major City
- Columbia
- State
- South Carolina (SC)
- Timezone
- Eastern Time (ET)
- Current Time
- –:––
- Overlay
- Yes – shares area with 803
Where is area code 839?
Area code 839 serves part of Columbia, SC and the surrounding areas. It has a single overlay (803) that serves the same area.
Overview of the 839 Area Code
What is the 839 area code?
The 839 area code serves Columbia, South Carolina, alongside other established area codes. When you see a 839 number, it indicates a local number within this geographic area.
Why was area code 839 created?
Area code 839 went into service on May 26, 2020, as an overlay of 803. An overlay adds a second code to the same territory instead of splitting it: existing 803 numbers kept their digits, new lines began receiving 839 numbers, and local calls in the region require all ten digits.
Geographic Coverage of the 839 Area Code
The 839 area code serves Columbia and surrounding areas in South Carolina. It operates within the Eastern Time (ET) time zone. It complements the coverage of area code 803. This area code covers several key cities, including:
- Columbia
- Rock Hill
- Sumter
- Fort Mill
- Aiken
- North Augusta
Got a call from an 839 number? It came from Columbia, SC. Since 839 overlays with 803, every local call in the region needs all ten digits to land on the right line. Of the listed cities' population, Columbia accounts for about 18.0%; the rest is split across 160 smaller cities.
Columbia Area Codes Overview
Columbia is served by multiple area codes, reflecting its telecommunications needs. The 839 area code operates alongside 803. Here are the area codes serving this region:
The introduction of the 839 area code helped prevent number exhaustion, ensuring a continuous supply of phone numbers across the geographic area.
What cities does area code 839 cover?
| City | State | Population | Population in 839 | % of listed-city population | % of City |
|---|---|---|---|---|---|
| Columbia | SC | 144,788 | 144,788 | 18.0% | 100.0% |
| Rock Hill | SC | 75,798 | 75,798 | 9.4% | 100.0% |
| Sumter | SC | 42,958 | 42,958 | 5.3% | 100.0% |
| Fort Mill | SC | 36,244 | 36,244 | 4.5% | 100.0% |
| Aiken | SC | 32,694 | 32,694 | 4.1% | 100.0% |
| North Augusta | SC | 26,395 | 26,395 | 3.3% | 100.0% |
| Lexington | SC | 25,354 | 25,354 | 3.2% | 100.0% |
| St. Andrews | SC | 20,493 | 20,493 | 2.6% | 100.0% |
| West Columbia | SC | 18,418 | 18,418 | 2.3% | 100.0% |
| Seven Oaks | SC | 15,144 | 15,144 | 1.9% | 100.0% |
| Tega Cay | SC | 14,294 | 14,294 | 1.8% | 100.0% |
| Dentsville | SC | 14,062 | 14,062 | 1.7% | 100.0% |
| Cayce | SC | 13,645 | 13,645 | 1.7% | 100.0% |
| Orangeburg | SC | 13,378 | 13,378 | 1.7% | 100.0% |
| Irmo | SC | 12,086 | 12,086 | 1.5% | 100.0% |
| Newberry | SC | 10,874 | 10,874 | 1.4% | 100.0% |
| Forest Acres | SC | 10,438 | 10,438 | 1.3% | 100.0% |
| Oak Grove | SC | 10,291 | 10,291 | 1.3% | 100.0% |
| York | SC | 9,830 | 9,830 | 1.2% | 100.0% |
| Red Bank | SC | 9,617 | 9,617 | 1.2% | 100.0% |
| Lancaster | SC | 9,396 | 9,396 | 1.2% | 100.0% |
| Woodfield | SC | 9,303 | 9,303 | 1.2% | 100.0% |
| Camden | SC | 8,899 | 8,899 | 1.1% | 100.0% |
| Lake Wylie | SC | 8,841 | 8,841 | 1.1% | 100.0% |
| Clover | SC | 7,558 | 7,558 | 0.9% | 100.0% |
| Lugoff | SC | 7,434 | 7,434 | 0.9% | 100.0% |
| Blythewood | SC | 6,733 | 6,733 | 0.8% | 100.0% |
| Belvedere | SC | 5,792 | 5,792 | 0.7% | 100.0% |
| Lake Murray of Richland | SC | 5,484 | 5,484 | 0.7% | 100.0% |
| Batesburg-Leesville | SC | 5,321 | 5,321 | 0.7% | 100.0% |
| Chester | SC | 5,230 | 5,230 | 0.7% | 100.0% |
| Brookdale | SC | 4,873 | 4,873 | 0.6% | 100.0% |
| Barnwell | SC | 4,589 | 4,589 | 0.6% | 100.0% |
| Clearwater | SC | 4,370 | 4,370 | 0.5% | 100.0% |
| Edgefield | SC | 4,147 | 4,147 | 0.5% | 100.0% |
| Newport | SC | 4,136 | 4,136 | 0.5% | 100.0% |
| Manning | SC | 3,832 | 3,832 | 0.5% | 100.0% |
| India Hook | SC | 3,328 | 3,328 | 0.4% | 100.0% |
| Winnsboro | SC | 3,279 | 3,279 | 0.4% | 100.0% |
| Burnettown | SC | 3,226 | 3,226 | 0.4% | 100.0% |
| Lesslie | SC | 3,112 | 3,112 | 0.4% | 100.0% |
| Denmark | SC | 3,072 | 3,072 | 0.4% | 100.0% |
| Dalzell | SC | 3,059 | 3,059 | 0.4% | 100.0% |
| Lakewood | SC | 3,032 | 3,032 | 0.4% | 100.0% |
| Bamberg | SC | 2,943 | 2,943 | 0.4% | 100.0% |
| Hopkins | SC | 2,882 | 2,882 | 0.4% | 100.0% |
| Bishopville | SC | 2,880 | 2,880 | 0.4% | 100.0% |
| Williston | SC | 2,879 | 2,879 | 0.4% | 100.0% |
| Gloverville | SC | 2,831 | 2,831 | 0.4% | 100.0% |
| Springdale | SC | 2,756 | 2,756 | 0.3% | 100.0% |
| Springdale | SC | 2,756 | 2,756 | 0.3% | 100.0% |
| Graniteville | SC | 2,614 | 2,614 | 0.3% | 100.0% |
| Hampton | SC | 2,602 | 2,602 | 0.3% | 100.0% |
| Edisto | SC | 2,559 | 2,559 | 0.3% | 100.0% |
| Cherryvale | SC | 2,496 | 2,496 | 0.3% | 100.0% |
| Allendale | SC | 2,496 | 2,496 | 0.3% | 100.0% |
| Wilkinson Heights | SC | 2,493 | 2,493 | 0.3% | 100.0% |
| South Sumter | SC | 2,411 | 2,411 | 0.3% | 100.0% |
| South Congaree | SC | 2,392 | 2,392 | 0.3% | 100.0% |
| New Ellenton | SC | 2,354 | 2,354 | 0.3% | 100.0% |
| Privateer | SC | 2,349 | 2,349 | 0.3% | 100.0% |
| Pine Ridge | SC | 2,326 | 2,326 | 0.3% | 100.0% |
| Johnston | SC | 2,214 | 2,214 | 0.3% | 100.0% |
| Kershaw | SC | 2,014 | 2,014 | 0.2% | 100.0% |
| Chapin | SC | 1,934 | 1,934 | 0.2% | 100.0% |
| Great Falls | SC | 1,926 | 1,926 | 0.2% | 100.0% |
| Blackville | SC | 1,906 | 1,906 | 0.2% | 100.0% |
| Winnsboro Mills | SC | 1,898 | 1,898 | 0.2% | 100.0% |
| St. Matthews | SC | 1,834 | 1,834 | 0.2% | 100.0% |
| Estill | SC | 1,770 | 1,770 | 0.2% | 100.0% |
| Elgin | SC | 1,657 | 1,657 | 0.2% | 100.0% |
| Elgin | SC | 1,657 | 1,657 | 0.2% | 100.0% |
| Gaston | SC | 1,641 | 1,641 | 0.2% | 100.0% |
| Jackson | SC | 1,635 | 1,635 | 0.2% | 100.0% |
| Gadsden | SC | 1,632 | 1,632 | 0.2% | 100.0% |
| Varnville | SC | 1,630 | 1,630 | 0.2% | 100.0% |
| Wedgefield | SC | 1,615 | 1,615 | 0.2% | 100.0% |
| Eureka Mill | SC | 1,476 | 1,476 | 0.2% | 100.0% |
| Langley | SC | 1,447 | 1,447 | 0.2% | 100.0% |
| Murphys Estates | SC | 1,441 | 1,441 | 0.2% | 100.0% |
| Whitmire | SC | 1,439 | 1,439 | 0.2% | 100.0% |
| Irwin | SC | 1,405 | 1,405 | 0.2% | 100.0% |
| Fairfax | SC | 1,389 | 1,389 | 0.2% | 100.0% |
| Stateburg | SC | 1,380 | 1,380 | 0.2% | 100.0% |
| Catawba | SC | 1,343 | 1,343 | 0.2% | 100.0% |
| East Sumter | SC | 1,343 | 1,343 | 0.2% | 100.0% |
| Holly Hill | SC | 1,259 | 1,259 | 0.2% | 100.0% |
| Prosperity | SC | 1,244 | 1,244 | 0.2% | 100.0% |
| Warrenville | SC | 1,233 | 1,233 | 0.2% | 100.0% |
| Oakland | SC | 1,232 | 1,232 | 0.2% | 100.0% |
| Cane Savannah | SC | 1,117 | 1,117 | 0.1% | 100.0% |
| Fort Lawn | SC | 980 | 980 | 0.1% | 100.0% |
| Branchville | SC | 969 | 969 | 0.1% | 100.0% |
| Gayle Mill | SC | 913 | 913 | 0.1% | 100.0% |
| Arcadia Lakes | SC | 856 | 856 | 0.1% | 100.0% |
| Heath Springs | SC | 852 | 852 | 0.1% | 100.0% |
| Santee | SC | 814 | 814 | 0.1% | 100.0% |
| Summerton | SC | 781 | 781 | 0.1% | 100.0% |
| Swansea | SC | 771 | 771 | 0.1% | 100.0% |
| Bowman | SC | 767 | 767 | 0.1% | 100.0% |
| Wagener | SC | 691 | 691 | 0.1% | 100.0% |
| Riverview | SC | 681 | 681 | 0.1% | 100.0% |
| North | SC | 677 | 677 | 0.1% | 100.0% |
| Eastover | SC | 628 | 628 | 0.1% | 100.0% |
| Pelion | SC | 623 | 623 | 0.1% | 100.0% |
| Gilbert | SC | 618 | 618 | 0.1% | 100.0% |
| Ridge Spring | SC | 588 | 588 | 0.1% | 100.0% |
| Mayesville | SC | 550 | 550 | 0.1% | 100.0% |
| Elloree | SC | 548 | 548 | 0.1% | 100.0% |
| Mulberry | SC | 529 | 529 | 0.1% | 100.0% |
| Pinewood | SC | 501 | 501 | 0.1% | 100.0% |
| Sharon | SC | 470 | 470 | 0.1% | 100.0% |
| Hickory Grove | SC | 469 | 469 | 0.1% | 100.0% |
| Summit | SC | 460 | 460 | 0.1% | 100.0% |
| Ehrhardt | SC | 437 | 437 | 0.1% | 100.0% |
| Springfield | SC | 437 | 437 | 0.1% | 100.0% |
| Alcolu | SC | 429 | 429 | 0.1% | 100.0% |
| Hilda | SC | 421 | 421 | 0.1% | 100.0% |
| Brunson | SC | 416 | 416 | 0.1% | 100.0% |
| Trenton | SC | 409 | 409 | 0.1% | 100.0% |
| Cameron | SC | 374 | 374 | 0.0% | 100.0% |
| Salley | SC | 351 | 351 | 0.0% | 100.0% |
| Neeses | SC | 315 | 315 | 0.0% | 100.0% |
| Lynchburg | SC | 309 | 309 | 0.0% | 100.0% |
| Rembert | SC | 306 | 306 | 0.0% | 100.0% |
| McConnells | SC | 287 | 287 | 0.0% | 100.0% |
| Norway | SC | 276 | 276 | 0.0% | 100.0% |
| Richburg | SC | 271 | 271 | 0.0% | 100.0% |
| Little Mountain | SC | 262 | 262 | 0.0% | 100.0% |
| Gifford | SC | 260 | 260 | 0.0% | 100.0% |
| Ridgeway | SC | 255 | 255 | 0.0% | 100.0% |
| Snelling | SC | 253 | 253 | 0.0% | 100.0% |
| Rowesville | SC | 251 | 251 | 0.0% | 100.0% |
| Eutawville | SC | 241 | 241 | 0.0% | 100.0% |
| Paxville | SC | 225 | 225 | 0.0% | 100.0% |
| Furman | SC | 223 | 223 | 0.0% | 100.0% |
| Perry | SC | 209 | 209 | 0.0% | 100.0% |
| Monetta | SC | 207 | 207 | 0.0% | 100.0% |
| Olar | SC | 206 | 206 | 0.0% | 100.0% |
| Lowrys | SC | 184 | 184 | 0.0% | 100.0% |
| Silverstreet | SC | 169 | 169 | 0.0% | 100.0% |
| Scotia | SC | 159 | 159 | 0.0% | 100.0% |
| Woodford | SC | 156 | 156 | 0.0% | 100.0% |
| Sycamore | SC | 143 | 143 | 0.0% | 100.0% |
| Kline | SC | 142 | 142 | 0.0% | 100.0% |
| Elko | SC | 140 | 140 | 0.0% | 100.0% |
| Pomaria | SC | 132 | 132 | 0.0% | 100.0% |
| Cordova | SC | 131 | 131 | 0.0% | 100.0% |
| Livingston | SC | 128 | 128 | 0.0% | 100.0% |
| Ward | SC | 124 | 124 | 0.0% | 100.0% |
| Vance | SC | 124 | 124 | 0.0% | 100.0% |
| Windsor | SC | 122 | 122 | 0.0% | 100.0% |
| Boykin | SC | 100 | 100 | 0.0% | 100.0% |
| Luray | SC | 99 | 99 | 0.0% | 100.0% |
| Oswego | SC | 84 | 84 | 0.0% | 100.0% |
| Ulmer | SC | 59 | 59 | 0.0% | 100.0% |
| Smyrna | SC | 55 | 55 | 0.0% | 100.0% |
| Peak | SC | 54 | 54 | 0.0% | 100.0% |
| Govan | SC | 53 | 53 | 0.0% | 100.0% |
| Jenkinsville | SC | 39 | 39 | 0.0% | 100.0% |
| Cope | SC | 32 | 32 | 0.0% | 100.0% |
City population is shown in full. The share of each city inside 839 is measured from Census tract centroids, not estimated from a rate-center match – so a city split between two codes appears on both, at the fraction each one actually holds. The “% of listed-city population” column uses the full populations of the cities listed here.
What counties does area code 839 cover?
1,747,102 residents across 20 counties, counted inside the 839 boundary — a county split between codes contributes only its part.
| County | State | Population in 839 | % of area-code footprint | % of County |
|---|---|---|---|---|
| Richland County | SC | 416,147 | 24% | 100% |
| Lexington County | SC | 293,991 | 17% | 100% |
| York County | SC | 282,090 | 16% | 100% |
| Aiken County | SC | 168,808 | 10% | 100% |
| Sumter County | SC | 105,556 | 6% | 100% |
| Lancaster County | SC | 96,016 | 5% | 100% |
| Orangeburg County | SC | 84,223 | 5% | 100% |
| Kershaw County | SC | 62,769 | 4% | 96% |
| Newberry County | SC | 37,719 | 2% | 100% |
| Chester County | SC | 32,294 | 2% | 100% |
| Clarendon County | SC | 26,339 | 2% | 85% |
| Edgefield County | SC | 25,657 | 1% | 100% |
| Fairfield County | SC | 20,948 | 1% | 100% |
| Barnwell County | SC | 20,589 | 1% | 100% |
| Lee County | SC | 16,531 | 1% | 100% |
| Hampton County | SC | 16,291 | 1% | 88% |
| Calhoun County | SC | 14,119 | 1% | 100% |
| Bamberg County | SC | 13,311 | 1% | 100% |
| Allendale County | SC | 8,039 | 0% | 100% |
| Saluda County | SC | 5,665 | 0% | 30% |
Sources: City populations – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). State populations – the same program, Vintage 2025 (CO-EST2025-ALLDATA). Area-code footprint and county populations – 2020 Census Centers of Population, mapped against NANP area code boundaries. The share of each city inside a code is measured the same way, against Census place boundaries from the Census Bureau's TIGERweb service. Area code assignments – NANPA CO Code data. See our data methodology.
Has area code 839 been reported for unwanted calls?
Yes – 291 unwanted-call complaints were reported to the FTC for numbers showing a 839 area code (May 29 – Aug 14, 2026).
- 62% robocalls
- ↑ 47% vs prior period
Most-reported subjects
- Other47%137
- Calls pretending to be government, businesses, or family and friends20%58
- Reducing your debt (credit cards, mortgage, student loans)13%37
Caller ID is easily spoofed, so these figures reflect the number shown on caller ID, not the caller's true location – an area code alone never identifies a caller. The FTC does not verify the facts in these complaints. Source: FTC Do Not Call (DNC) Reported Calls Data, retrieved 2026-08-17.
Which prefixes and exchanges belong to area code 839?
9% assigned to a telco
- 78% Landline
- 22% Wireless
- 0% Unknown
of 87 | ||
| Prefix | Usage | Carrier |
|---|---|---|
| (839)200- | Landline | Fractel |
| (839)201- | Landline | Hd Carrier |
| (839)202- | Landline | Southern Bell Tel & Tel |
| (839)203- | Wireless | Verizon Wireless |
| (839)204- | Landline | Comcast Ip Phone |
| (839)205- | Landline | Level 3 Communications |
| (839)206- | Wireless | T-Mobile Usa |
| (839)207- | Wireless | New Cingular Wireless Pcs |
| (839)208- | Wireless | New Cingular Wireless Pcs |
| (839)209- | Landline | Bandwidth.Com Clec |
| (839)210- | Landline | Bandwidth.Com Clec |
| (839)212- | Wireless | New Cingular Wireless Pcs |
| (839)213- | Landline | Windstream Nuvox |
| (839)214- | Wireless | New Cingular Wireless Pcs |
| (839)215- | Landline | Bandwidth.Com Clec |
| (839)216- | Landline | Powertel Atlanta Licenses |
| (839)217- | Wireless | New Cingular Wireless Pcs |
| (839)218- | Landline | Hd Carrier |
| (839)219- | Wireless | New Cingular Wireless Pcs |
| (839)220- | Landline | Nuso |
| (839)221- | Landline | Onvoy Spectrum |
| (839)222- | Landline | Fractel |
| (839)223- | Wireless | Verizon Wireless |
| (839)224- | Wireless | Verizon Wireless |
| (839)225- | Landline | Time Warner Cbl |
| (839)226- | Landline | Ton80 Communications |
| (839)227- | Landline | Ton80 Communications |
| (839)228- | Wireless | New Cingular Wireless Pcs |
| (839)229- | Wireless | New Cingular Wireless Pcs |
| (839)230- | Wireless | New Cingular Wireless Pcs |
| (839)231- | Wireless | New Cingular Wireless Pcs |
| (839)232- | Wireless | New Cingular Wireless Pcs |
| (839)233- | Wireless | New Cingular Wireless Pcs |
| (839)234- | Landline | Nuso |
| (839)235- | Wireless | Verizon Wireless |
| (839)236- | Wireless | New Cingular Wireless Pcs |
| (839)237- | Wireless | New Cingular Wireless Pcs |
| (839)238- | Landline | Nuso |
| (839)239- | Landline | Onvoy |
| (839)264- | Landline | Ton80 Communications |
| (839)266- | Landline | Ton80 Communications |
| (839)267- | Landline | Ton80 Communications |
| (839)269- | Landline | Onvoy |
| (839)272- | Landline | Ton80 Communications |
| (839)273- | Landline | Ton80 Communications |
| (839)274- | Landline | Ton80 Communications |
| (839)277- | Landline | Ton80 Communications |
| (839)278- | Landline | Ton80 Communications |
| (839)293- | Landline | Onvoy |
| (839)300- | Landline | Fractel |
| (839)333- | Landline | Fractel |
| (839)356- | Landline | Fractel |
| (839)363- | Landline | Onvoy |
| (839)388- | Landline | Onvoy |
| (839)399- | Landline | Skyetel |
| (839)400- | Landline | Fractel |
| (839)432- | Landline | Onvoy |
| (839)444- | Landline | Fractel |
| (839)465- | Landline | Fractel |
| (839)466- | Landline | Ton80 Communications |
| (839)500- | Landline | Fractel |
| (839)529- | Landline | Fractel |
| (839)569- | Landline | Onvoy |
| (839)600- | Landline | Fractel |
| (839)639- | Landline | Ton80 Communications |
| (839)666- | Landline | Fractel |
| (839)737- | Landline | Ton80 Communications |
| (839)746- | Landline | Ton80 Communications |
| (839)766- | Landline | Fractel |
| (839)777- | Landline | Fractel |
| (839)800- | Landline | Fractel |
| (839)810- | Landline | Onvoy Spectrum |
| (839)826- | Landline | Ton80 Communications |
| (839)832- | Landline | Ton80 Communications |
| (839)837- | Landline | Ton80 Communications |
| (839)845- | Landline | Ton80 Communications |
| (839)846- | Landline | Ton80 Communications |
| (839)854- | Landline | Onvoy |
| (839)866- | Landline | Ton80 Communications |
| (839)867- | Landline | Commio |
| (839)868- | Landline | Ton80 Communications |
| (839)876- | Landline | Ton80 Communications |
| (839)887- | Landline | Ton80 Communications |
| (839)888- | Landline | Fractel |
| (839)895- | Landline | Twilio International |
| (839)900- | Landline | Fractel |
| (839)999- | Landline | Fractel |
| No prefixes match “”. | ||
Frequently Asked Questions about the 839 Area Code
Who called me from a 839 number?
A 839 number is assigned to Columbia, South Carolina, so a call may come from there. But caller ID is easy to fake, and scammers often spoof a local 839 code to look nearby, so a 839 number doesn't prove the caller is local. Recently, 291 unwanted-call complaints were reported to the FTC for numbers showing the 839 code (62% flagged as robocalls). If you don't recognize the number, let it go to voicemail; a real caller will leave a message.
Is 839 a scam area code?
No area code is a scam on its own. 839 is a normal, officially assigned code for Columbia, South Carolina. Spam callers spoof local codes to raise the odds you answer, so 839 on your caller ID says nothing about who is really calling. Recently, 291 unwanted-call complaints were reported to the FTC for numbers showing the 839 code (62% flagged as robocalls). Judge the call itself, not the area code.
Why do I keep getting calls from the 839 area code?
Repeated calls from different 839 numbers are usually spoofing: a robocaller rotates through 839 numbers so each call looks local and slips past simple blocks. Recently, 291 unwanted-call complaints were reported to the FTC for numbers showing the 839 code (62% flagged as robocalls). Blocking one number rarely helps; voicemail screening, your carrier spam filter, and the Do Not Call Registry work better.
Should I answer an unknown 839 number?
If you aren't expecting a 839 call, let it ring to voicemail. Legitimate callers leave a message, most robocallers hang up when no one picks up, and answering can mark your number as active and bring more calls.
How do I block calls from the 839 area code?
Block a single 839 number from your recent-calls list (iPhone: tap the number, then Block this Caller; Android: tap the number, then Block or report spam). To cut the volume, turn on Silence Unknown Callers on iPhone or spam protection on Android, enable spam filtering from your carrier, and register at DoNotCall.gov. Blocking the entire 839 code also stops legitimate local calls, so use it only as a last resort.
Where is area code 839?
Area code 839 covers Columbia and the surrounding area in South Carolina, spanning 161 cities with about 1,747,102 residents. It shares its area with overlay code 803.
When did area code 839 go into service?
Area code 839 went into service on May 26, 2020. It was added as an overlay of 803, so 839 numbers serve the same area that 803 already covered.
Is 839 a real area code?
Yes. 839 is an active code in the North American Numbering Plan, assigned by NANPA and in service for Columbia, South Carolina. A real code can still show up on spoofed spam calls, so treat unknown 839 calls with normal caution.
What timezone is the 839 area code in?
The 839 area code is in the Eastern Time (ET). Because a number can be kept when someone moves or switches to VoIP, a specific 839 caller may not be in that zone.
How do I call a 839 number from abroad?
From outside the US, dial your country's exit code, then 1 (the US country code), then 839 and the seven-digit number. From a mobile phone you can usually just enter +1 839 followed by the number and let the phone add the exit code for you.