CallataGuidesGet a local business phone number in Warren, MI
Warren's area code, prefixes and carriers from NANPA records, and how to put a Warren number in front of your customers.
- Area code
- 586
- Exchanges
- 132NANPA-assigned
- Carriers
- 16
- Population
- 137,686Census 2024 est.
Warren area codes
Warren, in Macomb County, Michigan, had a Census-estimated population of 137,686 in July 2024. All 132 exchanges NANPA lists for its rate center are in area code 586. Warren is in the Eastern time zone.
According to NANPA's dialing-plan data, local calls within 586 are dialed as seven digits and toll calls as 1 plus ten digits.
| Area code | Exchanges here | Share | In service since | Overlay with | Time zone |
|---|---|---|---|---|---|
| 586 | 132 | 100% | 2001 | none | Eastern |
Source: NANPA utilized central office code file and NPA report, dated 10/01/2026.
Phone carriers in Warren
16 carriers hold the 132 exchanges assigned to Warren's rate center. New Cingular Wireless PCS, LLC - Il has the most, with 40. 86 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. The table counts codes by the operating company NANPA assigned them to, not by who serves each number today.
| Carrier (NANPA operating company) | Exchanges | Share |
|---|---|---|
| New Cingular Wireless PCS, LLC - Il | 40 | 30% |
| Cellco Partnership d/b/a Verizon Wireless - Mi | 20 | 15% |
| American Messaging Services, LLC | 16 | 12% |
| Omnipoint Communications Midwest Operations, LLC | 15 | 11% |
| Michigan Bell Tel CO | 13 | 9.8% |
| Spok, INC. | 5 | 3.8% |
| Onvoy, Llcv - Mi | 4 | 3.0% |
| Mcimetro Access Transmission Services LLC - Mi | 4 | 3.0% |
| Level 3 Communications, LLC - Mi | 4 | 3.0% |
| Comcast Ip Phone, LLC | 3 | 2.3% |
| Teleport Communications America, LLC - Mi | 2 | 1.5% |
| Paetec Itel, LLC | 2 | 1.5% |
Carrier names are the operating company (OCN) names on NANPA's utilized central office code file dated 10/01/2026. A carrier holding a code may port numbers to other carriers.
Exchanges (NPA-NXX) assigned in Warren
These are the central office codes NANPA records for Warren. A caller seeing one of them recognizes a local number. The earliest assignment date recorded in the file for these codes is 2001. 4 of the 132 were assigned in 2020 or later.
| Area code | Prefixes (NXX) |
|---|---|
| 586 | 202, 214, 215, 216, 219, 230, 234, 237, 250, 253, 258, 264, 268, 272, 274, 275, 276, 283, 301, 303, 306, 316, 319, 328, 344, 354, 365, 368, 377, 381, 382, 383, 402, 406, 413, 418, 429, 431, 434, 436, 438, 444, 446, 449, 457, 470, 474, 480, 481, 482, 487, 489, 495, 504, 506, 507, 524, 529, 536, 550, 553, 554, 556, 559, 565, 567, 568, 577, 604, 606, 607, 609, 620, 628, 634, 638, 641, 662, 663, 665, 668, 693, 698, 707, 708, 709, 717, 718, 722, 728, 733, 744, 748, 767, 795, 804, 805, 808, 819, 822, 825, 826, 830, 831, 832, 838, 845, 860, 864, 873, 883, 896, 898, 904, 912, 916, 918, 922, 933, 939, 946, 955, 974, 977, 978, 979, 981, 983, 994, 995, 996, 999 |
Source: NANPA utilized central office code file.
When Warren's exchanges were assigned
Assignment dates show when each block of Warren numbers was added to the local supply.
| Decade assigned | Exchanges | Share |
|---|---|---|
| 2000s | 7 | 18% |
| 2010s | 28 | 72% |
| 2020s | 4 | 10% |
Assignment dates as recorded in NANPA's utilized code file; codes without a recorded date are excluded.
How local numbers work in Warren
Phone numbers are tied to a rate center, the local calling area used to decide whether a call is local or toll. Warren's numbers are rated to the WARREN rate center in NANPA's records. A business number from one of the prefixes above shows up on customers' phones as a Warren number.
If your business already has a Warren number, porting it to Callata is free and keeps it on your cards, listings and vehicles.
The local business market
Warren is part of the Detroit-Warren-Dearborn, MI metro area, home to 4.4 million people in 2024. County Business Patterns counted 102,430 business establishments in the Detroit, MI metro area in 2023, employing 1,846,717 people. The largest sectors by establishment count are retail trade (14,016), health care and social assistance (13,890), and professional, scientific, and technical services (11,783).
| Industry | Establishments | Employees | Employees per establishment |
|---|---|---|---|
| Limited-service restaurants | 3,764 | 63,821 | 17.0 |
| Physician practices | 3,622 | 45,657 | 12.6 |
| Full-service restaurants | 3,191 | 65,669 | 20.6 |
| Law offices | 2,130 | 15,565 | 7.3 |
| Dental offices | 1,921 | 16,127 | 8.4 |
| Landscaping services | 1,711 | 8,261 | 4.8 |
| Residential remodelers | 1,621 | 5,924 | 3.7 |
| Insurance agencies and brokerages | 1,520 | 11,569 | 7.6 |
Selected small-business industries (six-digit NAICS) covered by these guides. Source: Census County Business Patterns 2023.
Setting up a Warren business line
Callata Office costs $99 per month for up to 5 people, and each additional user is $20 a month. That covers up to 3 local numbers, calling from a browser or your cell, transcribed voicemail, recorded calls with AI summaries, after-hours routing and E911 on each number.
If you already have a number in Warren, porting it to Callata is free. Texting from a local number requires a one-time carrier registration (10DLC, $49), and the numbers available in any area code depend on carrier inventory when you choose them.
Optional AI agents (receptionist, sales, support or scheduler) can answer calls after hours or when nobody picks up, take messages, text, email and transfer to your team. They are billed from prepaid AI minutes at $0.25 per minute, identify themselves as AI, and may only place outbound calls to people who consented, between 8am and 9pm.
An 18-person team is the benchmark here, the rounded average establishment size in the Detroit, MI metro area. Billed per seat at month-to-month list prices (checked September 28, 2026), RingCentral RingEX Core costs $540.00 a month and Ooma Office Pro $449.10. On Callata the same 18 people cost $359.00 a month, less than either per-seat plan.
| Provider (plan) | Pricing basis | Per month | Per year |
|---|---|---|---|
| Callata (Callata Office) | $99 incl. 5 users, $20 per extra user | $359.00 | $4,308.00 |
| Quo (Starter) | $19.00 per user | $342.00 | $4,104.00 |
| Nextiva (Core) | $23.00 per user | $414.00 | $4,968.00 |
| Ooma (Office Pro) | $24.95 per user | $449.10 | $5,389.20 |
| Dialpad (Standard) | $27.00 per user | $486.00 | $5,832.00 |
| RingCentral (RingEX Core) | $30.00 per user | $540.00 | $6,480.00 |
Competitor prices are each vendor's published month-to-month list price per user for its lowest plan that includes business calling and texting, checked September 28, 2026: Quo Starter $19, Nextiva Core $23, Ooma Office Pro $24.95 (Essentials excludes texting; one-time $29.95 activation not included), Dialpad Standard $27, RingCentral RingEX Core $30 ($20 billed annually). Prices exclude taxes and fees and may change; annual contracts lower some competitors' prices.
Frequently asked questions
What area code is Warren, MI?
586. All exchanges NANPA lists for Warren are in 586.
How many phone companies have exchanges in Warren?
16, holding 132 exchanges between them, according to NANPA's 10/01/2026 file.
Can I keep my existing Warren business number?
Yes. Porting an existing number to Callata is free. Texting from it starts after carrier registration (10DLC), a one-time $49 fee.
How much is a business phone line in Warren?
Callata is $99 a month with 5 users included, then $20 per additional user, with up to 3 local numbers; 18 users come to $359.00 a month. For comparison, 18 users on RingCentral RingEX Core list at $540.00 a month (checked September 28, 2026).