For Y Combinator founders
A US phone number for YC founders who aren’t in the US
You incorporated in Delaware, your customers and investors are in the US, and you’re building from somewhere else. Here’s the phone line that goes with that.
Most YC companies with founders abroad end up with the same shape: a Delaware C-corp, a US bank account, US customers, and a team in India, Nigeria, Brazil, Europe or Southeast Asia. The phone number is usually the last piece people sort out, and it shows up in more places than you’d think: the contact page, the Google Business profile, App Store Connect, payment providers, investor calls, and the support line customers expect to reach.
What you get
- A local US number for $2 a month. Pick the area code, for example 415 for San Francisco or 302 for Delaware. No US address, no contract and no per-seat plan.
- Calls ring in your browser wherever you are. Keep the web app open and US customers reach you like a normal phone. Call back from the web app or the iOS and Android apps for about 2.7¢ a minute, including 1-800 numbers.
- Texts and login codes in one inbox. 50 incoming texts a month are included per number, with a copy button for codes.
- Notes after each call. Turn on recording and AI notes and you get the case number, the amounts, the next steps and a transcript about a minute after the call.
- An AI agent that can answer. When it’s 3 a.m. where you are, point the number at an AI agent. It picks up, takes the message, and rings you if the caller asks for a person. How agents work.
What it costs a two-founder team
A realistic month for a pre-seed team: one US number ($2), two hours of calls to US customers and vendors (about $3.25), and recording with AI notes on half of them (about $1.40). That’s under $7, with no seat fees for the second founder. Business phone apps that charge per user usually start around $15 to $19 per person per month before international minutes. If your whole team is in the US and needs to send texts, those are a better fit; we compare them honestly in Quo (OpenPhone) vs VoixCall.
Set it up in ten minutes
- Create an account at app.voixcall.com. Sign in with Google, Apple or an emailed code. Your first call is free.
- Buy a number under My Numbers. Pick the state or area code your company uses.
- Put it on your website, Google Business profile and support page. Invite your co-founder.
- Optional: paste the setup prompt into your AI agent so it can make calls and answer the line. The prompt is on the home page.
Want us to do it? Request setup and we’ll reply within two business days with the numbers we can get you. That includes numbers outside the US if you also sell in the UK or Canada.
Questions
Do I need a US address or SSN for the number?
No. US and Canadian local numbers don’t need a US address, an SSN or a US company. You can use the line before or after you incorporate.
Can my co-founder use the same number?
Yes. Invite them to a shared balance. Incoming calls ring on every open tab of the web app for everyone on the account, and there are no seat fees.
Will Mercury, Stripe or Brex send codes to it?
Most services send codes to VoixCall numbers, but some refuse internet phone numbers. Test the ones you depend on with a $2 number before you put it on an account. Keep a mobile number on any account where losing access would hurt.
Can I send texts from it?
Not yet. Receiving texts and login codes works on web, iOS and Android. Sending needs US carrier registration, which is in progress.
Is this a YC deal or perk?
No. VoixCall isn’t affiliated with Y Combinator. This page is for founders in or applying to YC who run a US company from outside the US.