CallBox · first of the agentic atoms

Give your software a phone line.

A small box. Your own SIM. Your code — or an AI agent — makes and answers real phone calls, reads and sends SMS, and brings back answers. Flat monthly cost, not per minute.

Get early access Become a partner

The arithmetic

Seven times cheaper
than cloud telephony.

Metered telephony is priced per minute in every country on earth. A SIM card isn't. Wherever flat mobile plans exist — which is most of the world — the same arithmetic holds.

1.0×

cheaper, at 70 minutes of calls a day

Cloud telephony

≈ ₹1.20 per minute, metered

₹0

CallBox + your own SIM

₹349 per month, unlimited

₹349
Day 0 of 30· 0 minutes called· Difference ₹0
Break-even is about ten minutes a day. Past that, one number keeps climbing and the other never moves. Worked here in rupees because that is where the first batch ships — but run it in your own currency and the shape does not change.

What it does

Calls out. Answers in.
Texts either way.

01 / OUTBOUND

It calls for you

Give it a goal in plain words — book the table, ask if it's in stock, confirm the order, ring these twelve people. It dials, talks to whoever picks up, and comes back with a structured answer, not a recording.

02 / INBOUND

It answers for you

Your phone rings in the browser first. If nobody picks up, the assistant answers, handles the routine questions, takes the message and texts you what happened. A missed call stops being a lost customer.

03 / MESSAGES

It texts, too

Half of real phone business ends in "I'll text you that." It reads incoming SMS, replies, and sends the address, the price or the booking reference as a follow-up — inside the same conversation.

For developers

Your own SIM.
Your own model.

An open CLI, an agent skill and a plugin API. Bring your own LLM keys — we don't proxy your model and we don't want your data. The box is a programmable cellular line; what runs on it is yours.

callbox
# dial a number and let your agent take it from there
$ callbox call "+919876543210" --agent ./book-a-table.py

# answer whatever comes in, with your own handler
$ callbox serve --on-incoming "https://you.dev/hook"

# or just use it as a tool from any agent
> call the clinic and ask the earliest slot this week
  → {"slot": "Thu 09:40", "confirmed": true}

Early access

We're building the first batch.

Tell us which you are. No spam, no newsletter — one email when there's something real to try.

I want one

For your business, your clinic, your shop — or your own projects.

  • Your existing number, your own SIM
  • Flat monthly cost, not per minute
  • Early pricing for the first batch

I want to sell it

For installers, IT resellers, AV and CCTV shops, and integrators.

  • Demo hardware and full training
  • Revenue share, paid on recurring
  • Non-exclusive — no territory lock-in