Discover Area Code 858: Poway, California Coverage and Details - area-code -

Frequently Asked Questions

Area code 858 primarily covers Poway, California, but also includes portions of San Diego, La Jolla, Del Mar, Solana Beach, Rancho Santa Fe, and Carmel Valley. It serves a significant portion of northern San Diego County.
Area code 858 was created in 1999 because the existing 619 area code was running out of available phone numbers due to the rapid growth of landlines, pagers, and the emerging mobile phone market. This was intended to be a three-way split, but only 858 was implemented, and the area codes became an overlay in 2018.
Due to the 858/619 overlay, ten-digit dialing (1 + area code + 7-digit number) is required for all local calls, even within the same area code. This change, implemented in 2018, doubled the available phone numbers in the region.
Area code 858 is in an overlay with area code 619. This means both area codes serve the same geographic region, requiring 10-digit dialing for all calls within the region.
The California Public Utilities Commission (CPUC) oversees telecommunications regulations for area code 858. You can find detailed information on their official website: https://www.cpuc.ca.gov/.
Mandatory 10-digit dialing for area code 858 (along with 619) began in 2018 when the two area codes became an overlay. This means dialing both the area code and the seven-digit number is required for all local calls.
Area code 858 is geographically centered around latitude 32.96282 and longitude -117.03586. This places it within the Pacific Time Zone (PT).
To dial long distance to the 858 area code, use the standard 1 + area code + 7-digit number format (1+10D). This same format applies to local calls within the 858/619 overlay region.
Several major telecommunications companies serve the 858 area code, including Pacific Bell, Verizon, AT&T, T-Mobile, and Sprint, as well as many smaller providers. It's recommended to compare coverage, pricing, and features when choosing a service.
Area code 858 is located in the Pacific Time Zone (PT), which is the standard time observed throughout California.
No, you cannot dial 7 digits for local calls within area code 858. 10-digit dialing (including the area code) is mandatory due to the overlay with area code 619.
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