By David Thompson · Published May 4, 2026 · Updated June 8, 2026 · 8 min read
You can get a fax number in under 5 minutes — no fax machine, no phone line, no waiting for a technician. The fastest method is signing up for an online fax service, which assigns you a real, working fax number the moment you create an account. There are two other options (traditional landline and VoIP), but for most people in 2026, virtual is the obvious choice.
This guide walks through all three methods, helps you choose between local and toll-free numbers, and shows you exactly how to activate a virtual fax number step by step.
3 Ways to Get a Fax Number
There are three distinct paths to getting a fax number. Which one fits you depends on whether you already have hardware and how often you plan to fax.
| Method | Setup time | Hardware needed | Monthly cost |
|---|---|---|---|
| Online fax service (virtual) | Under 5 minutes | None | $5–$35/mo |
| Traditional phone line | 1–5 business days | Fax machine + landline | $20–$50/mo (line + machine) |
| VoIP fax service | 30–60 minutes | ATA adapter | $10–$30/mo |
For the vast majority of individuals and small businesses, Method 1 (online fax service) is the right choice: fastest setup, lowest cost, no equipment, and you can send and receive from any device.
Method 1: Online Fax Service (Virtual Fax Number)
An online fax service gives you a virtual fax number — a real 10-digit number that lives in the cloud instead of on a phone line. Incoming faxes arrive as PDF attachments in your email or inside a web/mobile app. Outbound faxes are sent through the same app.
How it works:
- You sign up for an account and choose a local or toll-free number
- The service assigns you a number immediately (no waiting period)
- Incoming faxes are converted to PDF and forwarded to your email
- You send faxes by uploading a PDF or image to the app and entering a fax number
Fastest Method
With mFax Business, you can have a working fax number in under 5 minutes. Choose a local or toll-free number, create your account, and start sending and receiving immediately — no hardware or phone line needed.
Best for: Individuals, small businesses, healthcare providers, legal firms, remote workers — essentially anyone who needs to fax without a dedicated machine.
For a deeper look at how virtual numbers work, see our virtual fax number guide.
Method 2: Traditional Phone Line (Landline)
If you already have a fax machine and a POTS (plain old telephone service) landline, you already have a fax number — it's the same number assigned to that phone line by your carrier. If you don't have the line yet, you'd need to order a dedicated fax line from your telephone provider.
How it works:
- Order a dedicated analog phone line from your carrier (AT&T, Verizon, etc.)
- The carrier assigns a 10-digit phone number to that line — this becomes your fax number
- Plug the line into the LINE port on your fax machine
- Configure your fax machine with a header and transmission settings
Downsides: Setup takes days, costs $20–$30/mo for the line alone (not counting the machine), and the number only works with equipment connected to that specific line. You also can't receive faxes when the machine is off or paper is jammed.
VoIP Lines Don't Work Well with Fax Machines
If your "phone line" is actually a VoIP line (common in modern offices and homes), it likely uses audio compression that corrupts fax signals. Standard fax machines need an analog signal to work reliably. See does fax need a phone line for the full explanation.
Method 3: VoIP Fax Service (T.38 Protocol)
A VoIP fax service uses the T.38 fax-over-IP protocol to transmit fax signals over internet infrastructure rather than analog lines. It requires an ATA (analog telephone adapter) device that connects your existing fax machine to a VoIP-based fax service.
How it works:
- Subscribe to a VoIP fax service that supports T.38 (e.g., Dialpad, 8x8)
- Connect an ATA adapter between your fax machine and your router
- Configure the adapter with the service credentials
- The service assigns a DID (Direct Inward Dial) number, which becomes your fax number
Best for: Businesses that already have fax machines and need to transition away from analog lines without replacing all their hardware.
This method is more complex than a pure online fax service and is only worth considering if you have a specific reason to keep the physical fax machine.
How to Get a Fax Number Online (Step by Step)
Here's exactly how to activate a virtual fax number in under 5 minutes:
Choose a provider
Go to mFax.to/business or another online fax service. Look for one that offers the number type you need (local or toll-free), the page volume that fits your usage, and HIPAA compliance if you handle sensitive documents.
Create your account
Enter your email and set a password. Most services ask for a payment method upfront (even for free trials). The signup process takes about 2 minutes.
Pick your fax number
Choose a local number (select your area code from the dropdown) or a toll-free number (800, 888, 877, etc.). You'll see a list of available numbers immediately. Pick one and confirm.
Configure notification settings
Set where incoming faxes are delivered — typically your email address. Most services let you forward to multiple email addresses, which is useful for teams.
Send a test fax
Send a 1-page test fax to your new number from another device to confirm it's working. The fax should arrive in your inbox within 1–2 minutes as a PDF attachment.
That's it. Your fax number is active and ready to share.
Local vs. Toll-Free Fax Numbers: Which Should You Choose?
Every online fax service lets you choose between a local area code number and a toll-free number. The right choice depends on your use case.
| Local Number | Toll-Free Number | |
|---|---|---|
| Format | Area code + 7 digits (e.g., 212-555-0100) | 800/888/877/866 prefix (e.g., 800-555-0100) |
| Best for | Local businesses, regional trust | National presence, multi-state clients |
| Cost to caller | Standard phone rates | Free for the person calling/faxing you |
| Availability | Depends on area code demand | Wide availability |
| Portability | Portable between providers | Portable between providers |
Rule of thumb: If your clients are local and you want to signal a local presence, pick a local number. If you serve customers across multiple states or want a professional, national-looking number, go toll-free.
For businesses, a dedicated fax number is a key part of your communications infrastructure — see our fax number for business guide for more on how to structure it.
How Much Does a Fax Number Cost?
The cost depends heavily on which method you choose and how many pages you send per month.
| Plan type | Monthly cost | Pages included | Best for |
|---|---|---|---|
| Free plan | $0 | 10–30 receive only | Occasional personal use |
| Basic virtual | $5–$10/mo | 100–200 pages | Light individual use |
| Business virtual | $20–$35/mo | 300–500 pages | Small business, healthcare |
| Traditional landline | $20–$30/mo | Unlimited (hardware limits apply) | High-volume, existing machine |
| Pay-per-fax | $0.99–$1.99 per fax | N/A — billed per transmission | Very occasional use |
For most small businesses, a $20–$35/mo virtual plan is the best balance of cost and capability. You get a dedicated number, HIPAA-eligible service, and the ability to send and receive without any hardware investment.
mFax Business plans start at about $9/mo (billed annually) and include a dedicated fax number (local or toll-free), HIPAA compliance features, and a team-friendly web dashboard. Pricing is usage-based with no rigid fixed tiers — you build your own plan with a live calculator, choosing the exact seats (1–35) and pages (200–5,000) you need and paying only for what you use.
Can I Get a Free Fax Number?
Yes — with caveats. Several services offer free fax numbers, but they come with meaningful restrictions:
- FaxBurner — free plan includes a temporary number (refreshes every 24 hours), 5 pages sent, 25 pages received per month
- CocoFax — free trial includes a temporary number valid for 24 hours, 10 pages
- Google Voice — provides a free phone number but does not support fax transmission (see Google Voice fax for why)
Free Numbers Are Temporary
Most free fax numbers are not permanent. If you share your fax number with a doctor's office, government agency, or business partner, a number that expires after 24 hours is useless. For anything beyond a one-time test, a paid plan with a permanent number is worth the ~$20/mo.
For a full breakdown of no-cost options, see our best free fax services guide.
Can I Port My Existing Fax Number?
If you already have a fax number with another provider and want to switch services without losing your number, porting is the answer. Most online fax services support number porting.
The porting process:
- Contact your new provider and request a port
- Submit a Letter of Authorization (LOA) — a signed form authorizing the transfer
- Provide a copy of your most recent invoice from the current provider
- Wait 5–10 business days for the transfer to complete
During the porting window, your old service remains active so you don't miss incoming faxes. Once the port completes, your number routes to the new service.
Don't Cancel Your Old Service Early
Canceling your current fax service before the port completes will release your number back into the pool and make it unavailable for porting. Always wait for port confirmation before canceling.
Getting a Fax Number for Business vs. Personal Use
The requirements are slightly different depending on your use case.
Personal fax number — you need to occasionally send medical records, tax forms, or legal documents. A basic online fax plan ($5–$10/mo) or a free plan covers this. A local number is fine.
Business fax number — you need a permanent, professional number to share on business cards, websites, and with clients. Features like HIPAA compliance, team access, and multiple users matter. A business plan ($20–$35/mo) with a toll-free or local number makes sense.
Healthcare and legal — HIPAA compliance is mandatory if you're transmitting protected health information (PHI). That means you need a provider that offers encryption, audit logging, and signs a Business Associate Agreement (BAA). See is faxing HIPAA compliant for a full breakdown of what's required.
mFax Business is designed for exactly this use case — HIPAA-ready, team accounts, and a dedicated virtual fax number, with a fully customizable plan you build around the exact seats and pages you need, starting at about $9/mo.
Get Your Fax Number Today
Getting a fax number no longer means calling your phone company, waiting for a technician, or buying equipment. The fastest and most practical path for most people is a virtual fax number from an online service.
Ready to get started? Visit mFax.to/business to claim your local or toll-free fax number in under 5 minutes. No hardware. No phone line. No waiting.
For personal faxing on the go, the mFax app lets you send faxes from your phone instantly — 5 million users, 4.8-star App Store rating.