So you incorporated a US company. doola, Firstbase, or Stripe Atlas walked you through the paperwork, you have a Delaware LLC or C-Corp, an EIN, and a US business bank account.
Then you hit the phone number question. The registration form has a required field. Your invoice template has a blank line for "Phone". Your new website's contact page looks wrong without one. Your W-9 asks for it.
What kind of US phone number do you actually need? And what are you going to do with it?
Let's be concrete, because most articles on this topic are vague marketing pages that promise the world. This one is going to tell you exactly what these services do, and — importantly — what no cheap service can do, including ours.
What "Phone-on-File" Actually Means
A phone-on-file is a US phone number you put in places that ask for one. It's not a phone you answer. It's a field you fill in.
Places that ask for your US phone number:
- Company registration forms — The initial formation documents, state annual reports, EIN application (Form SS-4), and registered agent records all have a phone field.
- Invoices and contracts — Your invoice template, MSA, engagement letter, and W-9 form (line 6, "Address") all expect a reachable number.
- Your website and email signature — A US-looking "Contact" block with a +1 number adds legitimacy when clients look you up.
- LinkedIn and marketing profiles — Your company page, Crunchbase, etc.
- Business tool signups — AWS, Google Cloud, Vercel, GitHub, Slack, Notion Team, and most B2B SaaS tools ask for a phone number during business account signup. Most accept any SMS-capable US number.
- Customer and partner inquiries — People reply to your invoices, your website contact, your sales emails. Sometimes they send an SMS.
In all of these cases, what you need is: (1) a real, routable +1 number, (2) that passes form validation, (3) that can receive SMS from normal senders, (4) that doesn't cost you $15+/month.
That's what IncNumber is built for.
What Phone-on-File Is Not For
Now here's where most articles lie to you. They tell you a $5/month US number can also be used for bank verification, P2P money transfer apps, neobank logins, brokerage account 2FA, and whatever else.
It cannot. And neither can any of the alternatives.
Here's the technical reality: every cheap US number service is VoIP-based. IncNumber and all the well-known business VoIP providers alike — all VoIP. Financial services detect VoIP numbers and block them for security reasons. This isn't a bug in any specific provider; it's a deliberate policy shared by most US banks, payment apps, and the identity/verification layers they depend on.
You will read blog posts and forum threads from people saying "I got a VoIP number to work with a payment app once." These are anecdotes. The blocks get tightened, not loosened, over time. Build your business on "I got it to work once" and you will eventually get locked out of a live account.
The only reliable way to receive 2FA from US banks and payment apps is a mobile carrier SIM — an actual T-Mobile, Verizon, or AT&T line, typically via a prepaid plan or a family member with a US address. That's not what IncNumber sells. That's not what anyone in our price range sells.
If you need a bank 2FA solution, stop reading this article and get a US prepaid SIM. If you need a phone-on-file, keep reading.
The Two Separate Problems
This is the key insight that most founders miss:
- Phone-on-file problem — Solved by IncNumber at $5/month. Form-valid, routable, SMS to email, works from anywhere.
- Bank/fintech 2FA problem — Solved only by a mobile carrier SIM. Requires a US address or a friend/family/service to receive the physical SIM.
These are different problems and they need different tools. A lot of founders try to solve both with one cheap service and then get frustrated when a payment app blocks them. Don't do that.
For problem #1, you probably do not need a $15/month business VoIP subscription. You need a number that validates on a form and receives normal SMS. That's a $5/month problem.
For problem #2, no amount of paying a SaaS will help. You need silicon in the real US mobile network.
Solve your phone-on-file problem for $5/month
Real US phone number that works on every form. SMS forwarded to email, no app needed, cancel anytime. Purpose-built for the number-on-file use case.
Get your US number →What You Can Actually Do With a IncNumber Number
- ✅ Use it on your company website, LinkedIn, invoices, W-9, contracts, pitch decks, email signature
- ✅ Put it on doola / Firstbase / Stripe Atlas registration forms and state filings
- ✅ Use it for AWS, Google Cloud, Vercel, GitHub, Slack, Notion, and most B2B SaaS signups
- ✅ Receive SMS from customers, partners, vendors, and cold outreach
- ✅ Receive a voice call (callers hear a greeting asking them to text instead — no English needed on your part)
- ❌ Not recommended: bank login 2FA, P2P money transfer apps, neobank sign-ups, brokerage/crypto account verification, or any other financial-app verification flow
We'd rather lose a sale than sell you something that will fail on a financial-app verification attempt next week. The founders who buy this service and stay for years are the ones who understand exactly what it's for.
How to Decide
If you're a non-US founder with a Delaware LLC or C-Corp and you just need a US number to exist on paper and your website, IncNumber at $5/month is what you're looking for.
If you need to receive 2FA from a US bank or payment app, go get a mobile carrier SIM. No cheap service, ours or anyone else's, solves that problem.
If you need both, get both. They cost different amounts because they solve different problems.