CallataGuidesBusiness phone system for computer systems design services firms in Charleston, SC
Computer systems design services firms in the Charleston-North Charleston, SC metro area: 105 establishments in 2023, the local area codes, and what phone service costs a 23-person team.
- Establishments
- 105CBP 2023
- Employees
- 2,390mid-March 2023
- Per 100k residents
- 12.1U.S. 17.1
- Rank
- 72nd of 577areas by count
The IT services firm market in Charleston, SC
The Census Bureau's 2023 County Business Patterns lists 105 establishments classified as Computer Systems Design Services (NAICS 541512) in the Charleston-North Charleston, SC metro area. They employed 2,390 people in mid-March and paid $218.8 million in annual payroll. By establishment count the area is 72nd out of 577 areas with published figures for computer systems design services firms.
Measured against its 870,000 residents (2024 estimate), the area has 12.1 computer systems design services firms per 100,000 people; the U.S. rate is 17.1, so Charleston, SC is 29.4% below the national figure. The average establishment here has 22.8 employees, compared with 13.2 nationally. Payroll per employee comes to $91,559, 25.1% below the national $122,171.
| Measure | Charleston, SC | South Carolina | United States |
|---|---|---|---|
| Establishments | 105 | 488 | 58,113 |
| Mid-March employees | 2,390 | 7,892 | 766,160 |
| Annual payroll | $218,825,000 | $783,240,000 | $93,602,442,000 |
| Employees per establishment | 22.8 | 16.2 | 13.2 |
| Payroll per employee | $91,559 | $99,245 | $122,171 |
| Establishments per 100,000 residents | 12.1 | 8.9 | 17.1 |
Census County Business Patterns 2023 (mid-March employment; annual payroll). Employees and payroll flagged high-noise are shown but not used in the text. Residents: Census Vintage 2024 estimates.
Establishment size: computer systems design services firms in Charleston, SC
Of the computer systems design services firms in Charleston, SC that had employees in March 2023, 60.0% had fewer than five (the U.S. share is 74.5%). 66.7% had fewer than ten. For a business of a few people, phone coverage is a staffing question as much as a technology one: someone has to be free to pick up, or the call needs somewhere sensible to go.
| Employment size | Establishments | Share | U.S. share |
|---|---|---|---|
| 1–4 employees | 63 | 60.0% | 74.5% |
| 5–9 employees | 7 | 6.7% | 9.7% |
| 10–19 employees | 11 | 10.5% | 6.5% |
| 20–49 employees | 10 | 9.5% | 5.0% |
| 50 or more employees | 14 | 13.3% | 4.4% |
Employment-size classes count establishments by mid-March 2023 employment. Establishments with no March employees are excluded from the size classes, so shares are of establishments with employees. Source: Census County Business Patterns 2023.
Calls an IT services firm in Charleston, SC has to catch
Managed IT and systems integration firms field support calls that range from a forgotten password to a server outage. Clients judge them by how quickly someone answers when something breaks.
A few of the calls that come in to computer systems design services firms in Charleston, SC:
- A vendor calls about a hardware order.
- A prospect calls to ask about managed IT.
- A user calls to reset a password.
Texting clients
IT firms text maintenance windows and ticket updates.
Team texting on Callata runs from your business number, so replies come from the practice or shop rather than someone's personal phone. It turns on after the one-time $49 carrier registration (10DLC) is approved.
Callata vs. per-seat pricing for computer systems design services firms in Charleston, SC
The average IT services firm in Charleston, SC has 22.8 employees, so a 23-person team is a reasonable benchmark. Per-seat business phone plans bill every one of those people. At month-to-month list prices checked September 28, 2026, 23 users on RingCentral RingEX Core cost $690.00 a month and 23 on Ooma Office Pro cost $573.85. Callata comes to $459.00 a month for 23 users ($99 a month with 5 users included, then $20 per additional user), below both.
Over a year, that is $2,772 less than RingCentral for an IT services firm in Charleston, SC of that size. Annual contracts lower some competitors' prices, so compare the plan you would actually sign.
| Provider (plan) | Pricing basis | Per month | Per year |
|---|---|---|---|
| Callata (Callata Office) | $99 incl. 5 users, $20 per extra user | $459.00 | $5,508.00 |
| Quo (Starter) | $19.00 per user | $437.00 | $5,244.00 |
| Nextiva (Core) | $23.00 per user | $529.00 | $6,348.00 |
| Ooma (Office Pro) | $24.95 per user | $573.85 | $6,886.20 |
| Dialpad (Standard) | $27.00 per user | $621.00 | $7,452.00 |
| RingCentral (RingEX Core) | $30.00 per user | $690.00 | $8,280.00 |
Competitor prices are each vendor's published month-to-month list price per user for its lowest plan that includes business calling and texting, checked September 28, 2026: Quo Starter $19, Nextiva Core $23, Ooma Office Pro $24.95 (Essentials excludes texting; one-time $29.95 activation not included), Dialpad Standard $27, RingCentral RingEX Core $30 ($20 billed annually). Prices exclude taxes and fees and may change; annual contracts lower some competitors' prices.
Which area code to use in Charleston, SC
NANPA records place the exchanges of the area's named cities and towns in 2 area codes. 843 has the most, with 267 of 330 exchanges (81%). A local number lets clients in Charleston, SC call without dialing out of area. Callata includes up to 3 local numbers, and which numbers are open in an area code depends on carrier inventory when you choose.
| Area code | Exchanges | Time zone | In service since | Overlay with |
|---|---|---|---|---|
| 843 | 267 | Eastern | 1998 | 854 |
| 854 | 63 | Eastern | 2015 | 843 |
Exchanges are NANPA-assigned central office codes (NPA-NXX) in the rate centers matched to the area's named places. Source: NANPA utilized code and NPA reports.
How Callata works for computer systems design services firms
For $99 a month, Callata puts a team of up to 5 on one plan ($20 for each person after that): up to 3 local numbers, unlimited inbound calls, a pooled allowance of 1,500 outbound US and Canada minutes per user, browser and cell calling, voicemail transcription with urgency triage, recorded calls with AI summaries and business-hours routing, with E911 on every number.
Porting a number you already use in Charleston, SC is free, and business texting is available once the carrier registration (10DLC) is approved; the registration carries a one-time $49 fee. Which specific numbers are open in a given area code depends on carrier inventory at the time you sign up.
AI agents are optional: an AI receptionist or scheduler can pick up when the team is busy or closed, take a message, send a text or email, or transfer the call. They draw on prepaid AI minutes ($0.25/minute), disclose that they are AI, and outbound AI calls require prior consent and are limited to 8am–9pm.
Frequently asked questions
How many computer systems design services firms are there in Charleston, SC?
Census County Business Patterns counted 105 computer systems design services firms in the Charleston-North Charleston, SC metro area in 2023. They employed 2,390 people in mid-March.
What does a business phone system cost for a 23-person IT services firm?
At month-to-month list prices checked September 28, 2026, 23 users cost $690.00 a month on RingCentral RingEX Core and $573.85 on Ooma Office Pro. On Callata, $99 a month with 5 users included, then $20 per additional user, the same team pays $459.00.
What area code should an IT services firm in Charleston, SC use?
Area code 843 has the most assigned exchanges among the area's named places, followed by 854. If you already have a local number, you can port it to Callata for free.
Can an AI receptionist answer calls for an IT services firm?
Yes. Callata's optional AI agents can answer when the team is busy or closed, take a message, text, email or transfer the call. They disclose that they are AI and are billed from prepaid AI minutes at $0.25 per minute.