California Reverse Phone Lookup

Reverse Phone Lookup

ThisNumber has over 28 million name and address records for about 23 million phone numbers, making it one of the best reverse phone lookup services for California residents. Stop wondering who called you and start using this free lookup tool to identify the unknown callers, verify California businesses, or research potential scam calls.

Identify Phone Number Location Using California Area Codes

To identify the location of an California phone number, you need to understand the North American Numbering Plan (NANP) structure that all Alabama numbers follow: +1 NPA NXX XXXX.

• +1 - Country code indicating the United States
• NPA - The area code reveals the geographic region where the number was originally assigned
• NXX - Central office code that locates the specific neighborhood and identifies the service provider
• XXXX - Subscriber number identifies the individual phone line within that local exchange

The area code (NPA) is your key to determining location. By matching the three-digit area code to California's regional assignments, you can identify which part of the state the phone number originates from. Each area code corresponds to specific cities and counties throughout California, making it possible to narrow down the caller's general location.

Here's a complete list of California area codes with major cities:

For latest California phone numbering regulations, contact Siamack "Bubba" Donighi at the California PUC via [email protected] or 916-894-5642.

California Phone Numbers

California has approximately 57.9 million active phone numbers. Cell phones are the dominant service with 48.7 million users, while traditional landlines are declining with 1.6 million connections statewide. Internet phone services account for about 7.5 million numbers.

This indicates that when you search a California phone number, it's very likely a cell phone. The continued decrease in landlines suggests that newer phone numbers may be more challenging to trace compared to older landline numbers that historically had more readily available public information.

California Voice Subscriptions (in thousands):

Source: FCC Voice Telephone Services Report

Top 5 US Cell Phone Companies

Most phone numbers are cell phones, and most cell phone numbers come from the top three United States wireless companies. Here are the top five US Cell Phone Companies in Q1 2025:

• Verizon - 146 million customers
• T-Mobile US - 131 million customers
• AT&T Mobility - 118 million customers
• Boost Mobile - 7 million customers
• U.S. Cellular - 4.4 million customers

Robocalls and Unwanted Calls in California

California residents experienced a decrease in unwanted calls in 2024, with complaints totaling 287,916—a decrease from the peak of 622,417 complaints in 2021, according to the latest National Do Not Call Registry Data Book.

Key Facts for California Residents:

• 161,548 of California's 287,916 complaints involved automated robocalls, representing a significant portion of all unwanted call reports statewide.
• 27,125 complaints were for fraudulent "imposter" schemes, followed by debt reduction (20,756) and medical/prescription scams (13,374).
• Over 28 million Californians have registered their numbers on the Do Not Call Registry, demonstrating strong community engagement in call protection efforts.
• A decrease in complaints from 2021's peak shows that protective measures may be making a difference for California households.
• 98,127 complaints involved live callers, indicating that human-operated scam operations continue actively targeting the state.
• California ranks #9 nationally for complaints per 100,000 population.

Verify Phone Number Owner to avoid Scam Calls California Fraud Statistics

According to the Federal Trade Commission's 2024 data, phone calls and text messages make up 35% of all fraud contact methods nationwide:

• Phone calls: 19% of fraud reports (284,659 reports, $948M in losses)
• Text messages: 16% of fraud reports (246,784 reports, $470M in losses)

More than 1 in 3 fraud attempts happen through phone communication. Phone call fraud costs victims a median of $1,500 per case. Text message fraud costs a median of $1,000 per victim.

In 2024, California residents reported 506727 fraud cases resulting in total losses of $1,678.7M, with a median loss of $542 per victim. With phone-based fraud representing such a significant portion of these cases, phone owner verification has become a critical consumer protection tool.

When you receive calls from unknown numbers, take a moment to research the caller's identity. Reverse phone lookup services allow you to search a phone number to find information about who's calling—including whether the number has been reported for fraudulent activity.

Received fraudulent calls or fallen victim to phone fraud? Report it immediately. Each report helps authorities identify fraud patterns and protect other consumers from similar scams.

Additional Contact:
California Attorney General
Rob Bonta
(916) 445-9555

Are Reverse Phone Lookups Legal in California? Your Privacy Rights Under the CCPA