840 Area Code: Fontana, CA | Who Called, Map & Local Time

Who Called Me from Area Code 840?

Quick answerA 840 call usually comes from Fontana or nearby communities, but caller ID can be spoofed, so a local-looking number isn’t proof. If there’s no voicemail, let it go: legitimate callers leave messages.

No voicemail? Let it go. Real callers leave messages.
Recognize the pattern? Check the number in the prefix lookup.
Getting repeats? ActiveArmor® blocks and labels them automatically.
Same prefix calling again? Compare it against this month’s most-reported 840 prefixes, right on this page.
Curious who issued a number? Every 840 prefix belongs to a carrier — the registry names it.

Been targeted?Report the call at reportfraud.ftc.gov — reports feed the complaint data that powers spam blocking, including the board on this page. AT&T customers already have ActiveArmor® screening built in.

Most-reported 840 prefixes this month

PrefixReported patternReport volume

(840) 221-XXXXRobocall-heavy

(840) 219-XXXXRobocall-heavy

(840) 210-XXXXRobocall-heavy

(840) 212-XXXXRobocall-heavy

(840) 837-XXXXRobocall-heavy

45 unwanted-call reports naming 840 numbers in FTC Do Not Call complaint data, July 2–17, 2026. Consumer-reported and unverified.

Block spam calls in the 840, included with AT&T wireless

AT&T ActiveArmor® is the network-level security that screens the calls this page is about:

Fraud calls blocked automatically on the network
Suspected spam labeled before you answer
Caller ID & custom call blocking in the free app
Reverse number lookup (available with ActiveArmor Advanced security. Fee required.)
Identity monitoring & identity theft insurance (available with ActiveArmor Advanced security. Fee required.)

Included with AT&T wireless plans. Requires compatible device/service and download of the AT&T ActiveArmor® app. Other terms & restrictions apply. May not detect all threats and may block wanted calls. Some features require Advanced mobile security ($7/mo.). See terms.

See how ActiveArmor works Included with the free 30-day AT&T Wireless^℠ trial

Try AT&T Wireless^℠ free for 30 daysDownload the AT&T app, activate a trial eSIM in minutes, and run our network side by side with your current service. No credit card, keep your number.

100GB of data plus 25GB hotspot
Unlimited talk & text in the U.S., Canada and Mexico
Texting from the U.S. to 200+ countries & territories
Access to the AT&T 5G network

Start your free trialCompatible iPhone required. 5G requires a compatible plan and device; coverage not available everywhere. Terms & restrictions apply.

Offer details

Service good for 30 days. Data: Limited to 100GB of data and 25GB of hotspot data. No additional data is available after limit is reached. Video is limited to SD quality. Talk & Text: Includes unlimited talk & text within the U.S. and unlimited text from the U.S. to over 230 countries. Limits: One trial per user. An unlocked, dual eSIM iPhone is required. You’ll receive a trial phone number that belongs to AT&T and is not available to be ported to another carrier or otherwise retained. Trial plan features and details may differ from or be unavailable in other AT&T plans. U.S. only. All terms subject to change at any time.

Is Area Code 840 a Scam?

No. 840 is a legitimate Fontana area code.

It’s added to the 909 region in 2021 and serves Fontana and surrounding communities. But legitimacy of the code says nothing about any single call. Scammers spoof local numbers constantly.

The code is realAdded to the 909 region in 2021; 121 assigned carrier prefixes serve it today.

Spoofing happens“Neighbor spoofing” fakes local numbers. No voicemail? Let it go.

Screening includedActiveArmor® labels and blocks suspected spam. Included with AT&T wireless plans.

Been targeted? Report it to the FTC at reportfraud.ftc.gov. Reports feed the complaint data that powers spam blocking.

Scam texts from area code 840 numbers

The most common area code 840 text scam is the “wrong number” opener: a friendly message that pretends to know you, then moves the chat to WhatsApp and eventually to an investment pitch. Scripts currently circulating:

“U at home?” · “Are you busy tomorrow?” · “How are you doing?”
Delivery-problem and job-offer texts that link out to a login page

Don’t reply. A response marks your number as live. Forward scam texts to 7726 (SPAM), and AT&T ActiveArmor® filters known senders automatically.

How number spoofing works in area code 840

Caller ID is easy to forge. Spoofing fakes the number a call displays. The real owner of that 840 number isn’t involved and usually has no idea. That’s why blocking one number rarely stops the calls.

A call from a number almost identical to yours (same 840 and prefix) is “mirror spoofing.” A missed call from your own number is never worth returning.
Strangers calling you back saying you called them? Your 840 number is being spoofed. It typically passes within days, and you don’t need a new number. Report it at reportfraud.ftc.gov.
The caller-ID checkmark: AT&T verifies network calls (STIR/SHAKEN). A verified mark means the displayed number wasn’t faked. No mark doesn’t always mean scam, but treat it with more caution.

Spoofed or not, the rule holds: unexpected caller, no voicemail? Let it go.

840 Area Code Prefix & Carrier Lookup

The three digits after the area code identify the carrier a number was issued to. All 121 assigned 840 prefixes below are real, from the public numbering registry. Type to filter.

This isn’t a reverse phone lookup: no legitimate free service can tell you who owns a specific number. What a 840 prefix does show: the carrier that issued it, whether it’s wireless, landline or VoIP, and the community it belongs to, which is often enough to judge whether a call was worth returning.

121 prefixes · updated monthly

Prefix	Carrier	Line type
840-200	FracTEL	Landline
840-201	AT&T Mobility	Wireless
840-202	AT&T Mobility	Wireless
840-203	AT&T Mobility	Wireless
840-204	AT&T Mobility	Wireless
840-205	Bandwidth.com	VoIP
840-206	AT&T Mobility	Wireless
840-207	T-Mobile	Wireless
840-208	Bandwidth.com	VoIP
840-209	T-Mobile	Wireless
840-210	T-Mobile	Wireless
840-212	T-Mobile	Wireless
840-213	T-Mobile	Wireless
840-214	T-Mobile	Wireless
840-215	T-Mobile	Wireless
840-216	T-Mobile	Wireless
840-217	T-Mobile	Wireless
840-218	Verizon Wireless	Wireless
840-219	T-Mobile	Wireless
840-220	Bandwidth.com	VoIP
840-221	Hd Carrier	Landline
840-222	FracTEL	Landline
840-223	Bandwidth.com	VoIP
840-224	AT&T Mobility	Wireless
840-225	AT&T Mobility	Wireless
840-226	Onvoy (Sinch)	VoIP
840-227	Verizon Wireless	Wireless
840-228	Verizon Wireless	Wireless
840-229	Verizon Wireless	Wireless
840-230	Boost Mobile	Landline
840-231	T-Mobile	Wireless
840-232	T-Mobile	Wireless
840-233	T-Mobile	Wireless
840-234	FracTEL	Landline
840-235	Commio	Landline
840-236	Onvoy (Sinch)	VoIP
840-237	Onvoy (Sinch)	VoIP
840-238	AT&T Mobility	Wireless
840-239	Onvoy (Sinch)	VoIP
840-240	Onvoy (Sinch)	VoIP
840-241	Onvoy (Sinch)	VoIP
840-242	Onvoy (Sinch)	VoIP
840-243	T-Mobile	Wireless
840-244	T-Mobile	Wireless
840-245	T-Mobile	Wireless
840-246	T-Mobile	Wireless
840-247	T-Mobile	Wireless
840-248	T-Mobile	Wireless
840-249	T-Mobile	Wireless
840-250	T-Mobile	Wireless
840-251	T-Mobile	Wireless
840-252	T-Mobile	Wireless
840-253	T-Mobile	Wireless
840-254	Onvoy (Sinch)	VoIP
840-255	Onvoy (Sinch)	VoIP
840-256	T-Mobile	Wireless
840-257	T-Mobile	Wireless
840-258	Verizon Wireless	Wireless
840-259	AT&T Mobility	Wireless
840-260	T-Mobile	Wireless
840-261	AT&T Mobility	Wireless
840-262	T-Mobile	Wireless
840-263	AT&T Mobility	Wireless
840-264	AT&T Mobility	Wireless
840-265	T-Mobile	Wireless
840-266	Verizon Wireless	Wireless
840-267	AT&T Mobility	Wireless
840-268	AT&T Mobility	Wireless
840-269	Onvoy Spectrum (Sinch)	VoIP
840-270	AT&T Mobility	Wireless
840-271	Verizon Wireless	Wireless
840-272	Onvoy Spectrum (Sinch)	VoIP
840-273	Onvoy (Sinch)	VoIP
840-274	Onvoy (Sinch)	VoIP
840-275	Verizon Wireless	Wireless
840-276	Verizon Wireless	Wireless
840-277	Verizon Wireless	Wireless
840-278	T-Mobile	Wireless
840-279	Verizon Wireless	Wireless
840-280	AT&T (Teleport Communications)	Landline
840-281	T-Mobile	Wireless
840-282	Onvoy (Sinch)	VoIP
840-283	Onvoy (Sinch)	VoIP
840-284	Onvoy (Sinch)	VoIP
840-285	Onvoy (Sinch)	VoIP
840-286	T-Mobile	Wireless
840-287	Onvoy (Sinch)	VoIP
840-288	Verizon Business (MCImetro)	Landline
840-300	FracTEL	Landline
840-333	FracTEL	Landline
840-336	FracTEL	Landline
840-345	FracTEL	Landline
840-356	FracTEL	Landline
840-400	FracTEL	Landline
840-444	FracTEL	Landline
840-465	FracTEL	Landline
840-466	Ton80 Communications	Landline
840-500	FracTEL	Landline
840-587	FracTEL	Landline
840-588	FracTEL	Landline
840-600	FracTEL	Landline
840-666	FracTEL	Landline
840-677	FracTEL	Landline
840-688	FracTEL	Landline
840-699	FracTEL	Landline
840-777	Terra Nova Telecom	Landline
840-788	FracTEL	Landline
840-799	FracTEL	Landline
840-800	FracTEL	Landline
840-804	Onvoy (Sinch)	VoIP
840-837	Ton80 Communications	Landline
840-840	Onvoy Spectrum (Sinch)	VoIP
840-877	FracTEL	Landline
840-888	Terra Nova Telecom	Landline
840-899	FracTEL	Landline
840-900	FracTEL	Landline
840-977	FracTEL	Landline
840-996	AT&T Mobility	Wireless
840-997	Onvoy (Sinch)	VoIP
840-998	Verizon Wireless	Wireless
840-999	Terra Nova Telecom	Landline

Line type reflects the registry assignment; ported numbers can differ. Unknown 840 number calling? ActiveArmor® screens it before you ever look it up.

Cities & Communities in and around Area Code 840

Communities the 840 serves, filtered against the numbering registry’s rate centers, with each community’s key ZIP codes and the AT&T home internet available there. Cities link to their local AT&T internet page.

City / community	Key ZIP codes	AT&T internet
Anaheim	92808, 92807, 92887	Fiber up to 5 GIG
Beaumont	92223, 92583, 92582	Fiber up to 1 GIG
Big Bear City	92314, 92386	Internet Air
Big Bear Lake	92315, 92386, 92333	Internet Air
Bloomington	92316, 92376, 92337	Fiber up to 5 GIG
Brea	92821, 92870, 92835	Fiber up to 5 GIG
Calimesa	92320, 92399, 92223	Internet Air
Chino	91710, 91708, 91709	Internet Air
Chino Hills	91709, 92887, 92823	Fiber up to 5 GIG
Claremont	91711, 91767, 91786	Internet Air
Colton	92313, 92324, 92350	Fiber up to 5 GIG
Corona	92882, 92879, 92881	Fiber up to 5 GIG
Crestline	92325, 92322, 92391	Check address
Diamond Bar	91765, 91789, 91766	Internet Air
Eastvale	92880, 92860, 91708	Fiber up to 5 GIG
El Monte	91732, 91731, 91780	Fiber up to 5 GIG
Fontana	92335, 92336, 92337	Fiber up to 5 GIG
Glendora	91741, 91740, 91773	Internet Air
Grand Terrace	92313, 92324, 92507	Fiber up to 5 GIG
Hacienda Heights	91745, 90602, 91744	Internet Air
Highland	92346, 92374, 92369	Fiber up to 5 GIG
Jurupa Valley	92509, 92337, 91752	Fiber up to 5 GIG
La Habra	90631, 90603, 92835	Fiber up to 5 GIG
La Habra Heights	90631, 90603, 91748	Fiber up to 5 GIG
La Puente	91744, 91746, 91745	Internet Air
La Verne	91750, 91773, 91767	Internet Air
Lake Arrowhead	92352, 92321, 92317	Internet Air
Loma Linda	92354, 92350, 92324	Internet Air
Lytle Creek	92358, 91739, 92407	Check address
Mentone	92359, 92374, 92373	Internet Air
Monrovia	91008, 91016, 91010	Fiber up to 1 GIG
Montclair	91763, 91762, 91767	Internet Air
Moreno Valley	92553, 92551, 92518	Internet Air
Nuevo	92548, 92567, 92571	Internet Air
Ontario	91761, 91764, 91762	Internet Air
Perris	92571, 92585, 92570	Fiber up to 5 GIG
Pomona	91766, 91768, 91767	Internet Air
Rancho Cucamonga	91737, 91701, 91730	Fiber up to 5 GIG
Redlands	92374, 92373, 92354	Internet Air
Rialto	92376, 92377, 92411	Fiber up to 5 GIG
Riverside	92506, 92504, 92501	Fiber up to 5 GIG
Rowland Heights	91748, 92821, 91792	Internet Air
Running Springs	92382, 92341, 92321	Check address
San Bernardino	92405, 92411, 92401	Fiber up to 5 GIG
San Dimas	91773, 91740, 91768	Internet Air
San Jacinto	92582, 92583, 92545	Internet Air
Santa Fe Springs	90670, 90650, 90605	Internet Air
South El Monte	91733, 91731, 91770	Fiber up to 5 GIG
Upland	91786, 91784, 91711	Internet Air
Walnut	91789, 91791, 91792	Internet Air
West Covina	91791, 91790, 91744	Internet Air
Whittier	90602, 90605, 90603	Internet Air
Yucaipa	92399, 92320, 92359	Internet Air

City list: AT&T service-area records and the public numbering registry. Key ZIPs: U.S. Census data for each community. Internet type: AT&T eligibility data, June 2026. Availability is always confirmed at your exact address.

840 Area Code Map

Area code 840 serves Fontana and nearby communities in CA.

Map of area code 840 coverage in California

↓ Printable PDF

Open the printable 840 map (PDF) · All California area codes · Home internet in Fontana

Counties Covered by the 840 Area Code

Los Angeles County

Share of combined population56%

Population10,014,009

Largest 840 cityPomona

Orange County

Share of combined population18%

Population3,186,989

Largest 840 cityAnaheim

Riverside County

Share of combined population14%

Population2,418,185

Largest 840 cityBeaumont

San Bernardino County

Share of combined population12%

Population2,181,654

Largest 840 cityFontana

Counties are served in whole or in part; population is U.S. Census Bureau ACS 2023.

The 840, explained

Area Code 840: More Than a Number in Fontana

In Fontana, the 840 is more than digits on a caller ID. It arrived in 2021, layered onto the 909 region, and it has meant Fontana and surrounding communities ever since — 121 carrier prefixes keep its lines busy today, and an established 840 number still says you’ve been here a while.

The map tells its own story: Fontana and surrounding communities, with 909 sharing the same streets today. Several codes, one local calling area, no long-distance between any of them — only the 840 came first.

Keeping a 840 matters here. An existing 840 number ports to a new phone, a new carrier, or a new AT&T line, and stays yours anywhere in the U.S. New lines in the area often draw 909 instead — one more reason locals hold on to theirs.

Need a new local number? Shop plans Keep your 840: bring it to AT&T

Internet, wireless & stores in the 840

AT&T Home Internet in Area Code 840

AT&T home internet serves communities across area code 840, with AT&T Fiber where it’s built and AT&T Internet Air covering the gaps. Availability is decided address by address; every community in the table above links to its local internet page.

No data capsNo annual contractNo equipment fees

AT&T Fiber: Ltd. avail/areas. Speeds based on wired connection. Actual speeds vary. For 5-GIG, single device wired speed maximum 4.7Gbps. For more info., visit att.com/speed101. AT&T Internet Air: AT&T Internet Air not available in all areas. In rare cases, if your usage is contributing to congestion on the network, AT&T will greatly reduce your speed for a minimum of 30 min.

Check availability at your address Home internet in Fontana ›

Pair it with wireless in an internet + wireless bundle. Run a business in the 840? AT&T Business Internet is available at many addresses.

Family streaming together on AT&T home internet

Fiber install day in the 840Check your address ›

Moving to Area Code 840?

Set up home internet in area code 840 before the boxes arrive, and find your new community in the table above or check your exact address below.

Your number moves with you: port your 840 number from anywhere, or keep your old number when you arrive. An AT&T store nearby can handle the whole switch in one visit.

1 · Check your addressSee Fiber or Internet Air availability in seconds.

2 · Schedule for move-in dayInstall lined up before the boxes arrive.

3 · Keep your numberYour mobile number ports; your internet moves.

Plan your move with AT&T

Couple setting up internet on a laptop among moving boxes

Get set up before move-in dayPlan your move ›

AT&T Wireless in Area Code 840

AT&T’s 5G network covers most of area code 840. ActiveArmor® spam blocking is included with every unlimited plan, your 840 number stays yours, and great cell phone deals in Fontana are a tap away.

5G across the 840ActiveArmor® includedKeep your 840 number

AT&T may temporarily slow data speeds if the network is busy. 5G req’s compatible plan & device. Coverage not available everywhere. Learn more at att.com/5Gforyou.

Shop wireless plans Bring your 840 number ›

Need a new 840 number? Ask when you activate a line: the 840 shares its territory with 909, so new lines may draw one of those codes, and porting an existing 840 number keeps it yours.

See the AT&T wireless coverage map for the 840 ›

Woman smiling at her phone on an Fontana street

Stay connected across FontanaShop wireless plans ›

AT&T Stores in Area Code 840

Looking for cell phone stores in area code 840? These stores serve the 840 area — walk in for switching, porting, upgrades and hands-on help. (The 840 is new enough that most local stores still answer on longer-established numbers.)

Fontana AT&T Store Store 16232 Foothill Blvd., Fontana+1 909-320-6240

Fontana AT&T Store Sierra Ave 9885 Sierra Ave, Fontana+1 909-354-5566

Fontana AT&T Store Sierra Lakes 16155 Sierra Lakes Pkwy, Fontana+1 909-757-6600

Cell phone stores in Fontana › All 57 locations: company owned and authorized retailers

Every AT&T store in the region, company owned and authorized retailer alike, each with its own store page.

AT&T store employee helping a customer with her phone

Real help from real people in FontanaFind your store ›

All AT&T Stores Serving the 840 Area

Every AT&T store serving the 840’s communities. Tap any number to call.

65 AT&T locations serving the 840 area

City	Store	Phone
Anaheim	AT&T Store Resort	+1 657-207-0854
Anaheim	AT&T Store Lincoln Ave	+1 714-774-5100
Anaheim	AT&T Store Hills Store	+1 714-208-6973
Anaheim	AT&T Store Anaheim	+1 714-408-4520
Bakersfield	AT&T Store River Walk	+1 661-243-8328
Bakersfield	AT&T Store Artisan Square	+1 661-765-6690
Bakersfield	AT&T Store Panama	+1 661-200-0329
Bakersfield	AT&T Store Vp Mall	+1 661-247-1449
Bakersfield	AT&T Store Rosedale Store	+1 661-368-7591
Bakersfield	AT&T Store East Hills Store 587	+1 661-368-7597
Bakersfield	AT&T Store Truxtun Store 32	+1 661-368-7595
Bakersfield	AT&T Store Store	+1 661-368-7593
Bakersfield	AT&T Store Bakersfield	+1 661-615-8287
Bakersfield	AT&T Store Mrktplace	+1 661-200-0328
Bakersfield	AT&T Store Rosedale	+1 661-588-6777
Beaumont	AT&T Store Beaumont	+1 951-999-4072
Brea	AT&T Store Plaza Store 230	+1 714-208-6975
Chino Hills	AT&T Store Chino Spectrum Store 740	+1 909-320-6246
Corona	AT&T Store Corona	+1 951-547-2124
Corona	AT&T Store Crossings	+1 951-817-6630
Corona	AT&T Store Country Side Center	+1 951-898-0700
Diamond Bar	AT&T Store Diamond Bar Store	+1 909-861-7888
Diamond Bar	AT&T Store Diamond Bar	+1 909-588-6668
Eastvale	AT&T Store Eastvale	+1 951-540-4774
Fontana	AT&T Store Sierra Lakes	+1 909-757-6600
Fontana	AT&T Store Store	+1 909-320-6240
Fontana	AT&T Store Sierra Ave	+1 909-354-5566
Hacienda Heights	AT&T Store Hacienda Heights	+1 626-686-1116
Highland	AT&T Store Crossings	+1 909-863-8641
La Habra	AT&T Store Store 839	+1 562-379-8983
La Verne	AT&T Store La Verne	+1 626-327-4249
Montclair	AT&T Store Montclair Center	+1 909-333-4019
Moreno Valley	AT&T Store Towngate Center	+1 951-817-6634
Moreno Valley	AT&T Store Moreno Valley	+1 951-247-6295
Ontario	AT&T Store Mills Pc A	+1 909-235-7030
Ontario	AT&T Store Grove	+1 909-320-6254
Ontario	AT&T Store Ontario	+1 909-295-6163
Perris	AT&T Store Perris	+1 909-595-9005
Pomona	AT&T Store Pomona	+1 909-927-8384
Rancho Cucamonga	AT&T Store Rancho Cucamonga	+1 209-379-4716
Rancho Cucamonga	AT&T Store Victoria Gardens	+1 909-320-6248
Redlands	AT&T Store Store 739	+1 909-320-6250
Rialto	AT&T Store Foothill Blvd	+1 909-966-4900
Rialto	AT&T Store Riverside Pkwy	+1 909-966-5034
Riverside	AT&T Store Gateway Tyler Street	+1 951-817-6632
Riverside	AT&T Store Riverside	+1 951-684-1113
Riverside	AT&T Store Riverside	+1 951-394-2688
Riverside	AT&T Store Jurupa Valley	+1 951-667-1966
Riverside	AT&T Store Limonite	+1 951-360-2142
Riverside	AT&T Store Riverside	+1 951-656-9200
Rowland Heights	AT&T Store Nogales	+1 626-820-0692
Rowland Heights	AT&T Store A Store	+1 626-839-8528
Rowland Heights	AT&T Store Store 210	+1 626-320-1618
San Bernardino	AT&T Store Store 117	+1 909-320-6252
San Bernardino	AT&T Store San Bernardino	+1 909-473-7999
San Dimas	AT&T Store Store 317	+1 909-320-6242
Santa Fe Springs	AT&T Store Santa Fe Springs	+1 424-219-9001
South El Monte	AT&T Store South El Monte	+1 626-414-2201
Upland	AT&T Store Store 277	+1 909-320-6244
West Covina	AT&T Store Westfield Fashion Place	+1 626-320-1612
West Covina	AT&T Store 2 Store	+1 626-709-3000
West Covina	AT&T Store Store Trfzs	+1 626-331-8900
Whittier	AT&T Store Whittier	+1 562-945-5262
Whittier	AT&T Store Whittier	+1 562-800-4053
Yucaipa	AT&T Store Yucaipa	+1 909-790-5004

International Calling from Area Code 840

Calling abroad from area code 840? AT&T International Calling adds discounted or unlimited rates to 200+ countries on top of your existing plan, and unlimited texting from the U.S. to 200+ destinations is already included on AT&T unlimited plans.

Where the 840 calls most:MexicoPhilippinesChinaIndiaVietnam

Top places of birth among foreign-born residents of the 840’s counties, U.S. Census Bureau ACS 2023.

Calling abroad from a 840 number: dial 011 + country code + number (or just + on a mobile). Traveling abroad instead? International Day Pass® takes your talk, text and data with you for a flat daily rate.

International Calling and International Day Pass® availability, rates and included destinations vary by plan; see att.com for the current country list.

See international calling plans

Father and son waving during a video call with family abroad

Fontana calls the worldSee international plans ›

840 Area Code Quick Facts & Dialing

StateCalifornia

Time zonePacific

Overlays909share this territory

Established2021added to the 909 region

Dialing10 digitsrequired

Toll-free?Nogeographic code

Population17.8Mcounties served, Census 2023

Largest cityFontana+52 more ›

How to dial a 840 number

Scenario	Format	Example
Local call (within the region)	840 + 7-digit number	(840) 555-0100
Long distance (within the U.S.)	1 + 840 + 7-digit number	1 (840) 555-0100
Calling 840 from another country	+1 840 + 7-digit number	+1 840 555 0100
From a mobile phone	(840) + 7-digit number	(840) 555-0100

A Short History of Area Code 840

Added in 2021 to the 909 region, the 840 serves Fontana and surrounding communities. No splits or overlays have divided its territory since.

2021Added to the 909 region

In service since 2021. Today the 840’s territory is shared with overlay code 909, so ten-digit dialing is required.

Nearby & Related Area Codes

909Overlay 951Also California 714Also California 760Also California 949Also California

Browse area codes by state: California (41) · Texas (29) · Florida (23) · all 50 states ›

Area Code 840 FAQ

What area code is 840?

840 is the area code for Fontana, California and the surrounding communities. It appears at the front of every local 10-digit phone number in the area.

Where is area code 840?

Area code 840 serves Fontana, California and nearby communities including Anaheim, Arrowhead Farms, Bakersfield. The full city list is in the cities table above.

Why did I get a text message from a 840 number?

The most common 840 text scam opens like a wrong number (“u at home?”, “are you busy tomorrow?”) and tries to move you to WhatsApp. Don’t reply. Forward the text to 7726 (SPAM) and delete it. AT&T ActiveArmor® filters known scam senders automatically.

Who called me from area code 840?

A 840 number usually means Fontana or a nearby community, but spoofing is common. This page’s prefix lookup isn’t a reverse phone lookup — it can’t name the caller, but it shows the carrier, line type and community a number was issued to, which is often enough to judge a call.

What time zone is area code 840?

Pacific time. The live local time is shown at the top of this page.

Why am I getting calls from 840 numbers?

840 is an active, legitimate California area code, but scammers spoof local numbers because people answer them. If there’s no voicemail, let it go. AT&T ActiveArmor® blocks and labels spam automatically, and you can report unwanted calls at reportfraud.ftc.gov. The spam report board above shows which 840 prefixes are drawing complaints right now.

Is 840 a toll-free number?

No. 840 is a geographic area code tied to Fontana, California. Toll-free calls come from 800, 833, 844, 855, 866, 877 and 888 numbers.

What’s the difference between 840 and 909?

Nothing on the map: 840 is an overlay of 909, covering the same Fontana area. Calls between them are local; only the three digits at the front differ.

Which cities use area code 840?

The largest communities include Anaheim, Beaumont, Big Bear City, Big Bear Lake, Bloomington. The full list is in the cities table above.

Does AT&T offer service in the 840?

Yes: home internet, wireless and retail stores across the 840. Availability is checked address by address.

Can I still get a 840 number?

Yes. Carriers in Fontana and across the 840 still issue 840 numbers on new lines, and you can port an existing 840 number to any carrier. Newer lines in the same area may also receive numbers from an overlay code.

Can I keep my 840 number if I move?

Yes. Phone numbers are portable: your 840 number can move with you anywhere in the U.S., whether you stay with your carrier or switch.

Sources: city and store data from AT&T records; prefix and carrier assignments from the public numbering registry (pulled July 2026). Facts regenerate monthly.