United States Phone Numbers: Format, Area Code & Validation Guide - phone-number-standards -

Frequently Asked Questions

The area codes for Charlotte, North Carolina are 704 and 980. Originally, 704 covered the entire state, but due to growth, the 980 overlay was added in 2000. This was the first overlay in the state, meaning both area codes serve the same geographic region, requiring 10-digit dialing.
To dial a local number in North Carolina, you must dial the area code followed by the 7-digit number. For example, 919-555-1212. This 10-digit dialing is mandatory for all local calls in the state due to the implementation of the 988 National Suicide Prevention Lifeline.
North Carolina requires 10-digit dialing for all local calls to accommodate the 988 National Suicide Prevention Lifeline. This nationwide change ensures consistent dialing procedures and access to essential services.
Area code 252 serves the eastern region of North Carolina, including cities like Greenville, Rocky Mount, Wilson, and coastal areas such as the Outer Banks and Elizabeth City. It was created in 1998 to relieve the 919 area code.
The 743 area code is an overlay for the 336 area code in the central Piedmont region of North Carolina, covering cities like Greensboro, High Point, and Winston-Salem. Since it's an overlay, you should always dial 10 digits (area code + number) when calling this region.
You can validate a North Carolina phone number using regular expressions. The article provides JavaScript code with regex examples for standard numbers (like +1-252-555-1212), toll-free numbers (like +1-800-555-1212), and premium rate numbers (like +1-900-555-1212).
Premium rate services in North Carolina are subject to strict regulations. Providers must disclose rates clearly in both English and Spanish before charging, register with the NCUC, and adhere to specific technical requirements for call flows, including rate disclosure and opt-in confirmation.
Number portability in North Carolina allows consumers to keep their phone numbers when switching service providers. The process follows FCC guidelines, and carriers are required to support number porting. Typical porting takes one business day but complex cases might take 4–7 business days.
The North American Numbering Plan Administration (NANPA) sets guidelines for efficient and equitable phone number allocation and management. North Carolina follows these guidelines, including number verification, utilization monitoring, and reporting, to ensure responsible use of numbering resources.
North Carolina's area codes divide the state into regions: 252 (East), 336/743 (Central Piedmont), 704/980 (Charlotte), 828 (West/Mountains), 910/472 (Southeast), and 919/984 (Research Triangle). Several regions use overlays, meaning two codes cover the same area.
North Carolina employs several strategies to conserve phone numbers, such as allocating numbers in thousand-block increments (number pooling), optimizing rate center boundaries, assigning numbers sequentially within a block, and reclaiming unused numbers from carriers.
Connecting to the NPAC database requires credentials from iconectiv. The article provides example JavaScript code using Node.js and fetch to interact with the NPAC API. You need to configure the API endpoint, token, timeout, and retry attempts. A unique request ID is necessary for each lookup.
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