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Notas de campo de sistemas telefônicos reais.

Atualizações de produtos, engenharia de bastidores, histórias de clientes e, ocasionalmente, uma opinião forte. Escrito pelas pessoas que construíram o letsdial.

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513 Area Code: Cincinnati, Ohio Guide

The 513 area code answers across southwestern Ohio — not California — covering Cincinnati, home to Procter & Gamble and Kroger's headquarters, the oldest franchise in professional baseball, and the...

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Ariano Khan
August 3, 2026 · 7 minutos de leitura
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Novo

442 Area Code: Coachella Valley & Inland Empire Guide

The 442 area code serves a vast stretch of Southern and Eastern California as an overlay of 760, covering the Coachella Valley (Palm Springs, Palm Desert), High Desert (Victorville, Hesperia), North San Diego County (Oceanside, Escondido), and the Imperial Valley.

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Ariano Khan
June 27, 2026 · 8 min read
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480 Area Code: Why Phoenix Numbers No Longer Match Location

Dial a number in Scottsdale, Chandler, or Tempe today, and it could carry a 480 area code, a 602, or a 623 — and there's no longer any way to tell which just by the prefix. That wasn't always true. For over two decades, the three codes marked separate territory across Phoenix. Regulators erased those lines in 2023.

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Ariano Khan
July 13, 2026 · 8 min read
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520 Area Code: Tucson's Calm Corner of Arizona Dialing

While Phoenix juggles three overlapping area codes on one map and Louisville counts down to a new overlay of its own, the 520 area code is having a quieter decade. Tucson and the counties around it still run on a single prefix, with regulators confirming as recently as this year that the region has adequate numbering resources — no split, no overlay, no countdown clock.

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Ariano Khan
August 29, 2024 · 8 min read
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602 Area Code: The Code Every Other AZ Code Left

Every other area code covering Arizona today exists because a piece of it broke away from the 602 area code at some point since 1995. 520, 928, 480, 623 — all of them trace their numbers back to the same original prefix. What's left of that original territory now is just the urban core of Phoenix.

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Ariano Khan
July 13, 2026 · 8 min read
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747 Area Code: San Fernando Valley & Burbank Guide

The 747 area code overlays 818 across the San Fernando Valley in Los Angeles County — Burbank studios, Glendale, Van Nuys, North Hollywood, Woodland Hills, and Calabasas. Activated May 18, 2009, with mandatory 10-digit dialing throughout.

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Ariano Khan
August 17, 2024 · 8 min read
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858 Area Code: North San Diego, La Jolla & UCSD Guide

The 858 area code covers the northern portions of San Diego including La Jolla, Mira Mesa, Scripps Ranch, Rancho Bernardo, Carmel Valley, Del Mar, and Solana Beach. Created in 1999 when 619 was split, 858 anchors one of the world's premier biotech and life sciences clusters.

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Ariano Khan
August 22, 2024 · 8 min read
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860 Area Code: Hartford's Insurance Capital and Central Connecticut

The 860 area code covers Hartford and central and eastern Connecticut — the insurance capital anchored by The Hartford, Travelers, and Aetna, plus Pratt & Whitney's aerospace campus and the University of Connecticut. Split from 203 in 1995 and overlaid by 959 in 2014, 860 remains the region's original prefix.

AK
Ariano Khan
August 17, 2024 · 7 minutos de leitura

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