AI Assistant Over
Any Phone Line
— No App Required.
Instant voice AI available on demand. Dial in, talk,
and get answers in real time.
How It Works
Three steps. Zero friction.
Choose Your Minutes
Select your desired call duration using the interactive pricing calculator below. Only pay for what you use.
Dial Line Zero
Call the hotline number from any registered device. Landlines, smartphones, or feature phones — all supported.
Talk Instantly
Speak naturally with our low-latency conversational AI. No menus. No waiting. Just answers.
Built for Real Conversations
Production-grade AI delivered over plain old telephone lines.
Ultra-Low Latency
Natural voice response with near-zero lag. Optimized for speed without sacrificing intelligence — the model tunes its depth to your question, so quick answers stay instant and complex ones get the reasoning they need.
Persistent Context
Remembers your preferences and past conversations. Every call picks up exactly where you left off.
Built-In Tools
Web search and deep research built right into the call. Searches are free within your monthly share ($0.014 each beyond it), and a full deep-research request runs about 1–2¢ — the only extras on top of the per-minute price.
Simple, Transparent Pricing
An estimated $0.045 per minute covers the whole conversation — speech recognition, the AI, and voice responses are all included. Deep research is the only in-call extra (about 1–2¢ per use), and web search is free up to your account's monthly share (then $0.014 per query). No subscriptions. No hidden fees.
Frequently Asked Questions
Everything you need to know about talking to AI over the phone.
What's it like talking to Line Zero?
You call in and just start talking — it answers in a natural voice, in real time. Ask anything you'd ask a person: practical questions, explanations, or a topic worth digging into. It can search the web mid-conversation, run deeper research when a question deserves it, and email you a summary of what you covered. Ask follow-up questions, change direction, or explore a difficult topic — it responds naturally and keeps the conversation moving.
Does it remember me between calls?
Yes — and it gets better over time. The things you tell it about yourself, your preferences, and everything you've talked about before carry over, so you never start from scratch. Ask it to remember something once, and it's there on your next call.
Do I need to install anything?
No. Line Zero runs over a normal phone call. Once you have minutes, just dial in — landlines, smartphones, and feature phones all work.
How do I get my minutes after paying?
You'll receive an email with everything you need: the phone number to call and your 6-digit account code. Enter the code when prompted on your first call and your balance is ready. If you already have an account, switch the calculator to “Access Code” and top up with your existing code instead.
What's included in the per-minute price?
Everything in a normal conversation — speech recognition, the AI, and voice responses. The only in-call extras are deep research (about 1–2¢ per use) and web searches beyond your free monthly share ($0.014 each). Minutes are non-refundable, and your carrier's standard rates still apply for placing the call.
Can it send me things in writing?
Yes. Ask during the call to have a summary of what you covered emailed to you, and anything you tell it to remember — notes, preferences, facts about you — is saved and waiting on your next call.
Have Questions?
Our team is here to help with any inquiries or support.