Our Grok Bots use PhoneZero whenever they need to call someone, either because a call is the preferred way to reach them or because websites and other MCPs aren’t enough to finish the task. The bot plans the call, gets your yes, places it, and reports back what a live person said.
Real calls
Tokyo trip planning
A trip-planning Grok Bot determined it needed to call a local restaurant to complete a Japanese booking. It used PhoneZero to place the call overnight and reported back with the reservation info.
Local plans with friends
Choosing where to meet up with friends, a local planning Grok Bot called the restaurant through PhoneZero to confirm the group could bring their dogs. Then it completed the booking on OpenTable, which didn’t disclose the dog policy.
How a call works
If a website or booking service can finish the job, the bot uses it. The phone is for when they can’t.
It shows who it will call, what it will ask, and the name it will introduce itself with, then waits for an explicit yes.
An xAI voice agent places the call from your own Telnyx number and talks with the person who answers.
Succeeded, unavailable, no answer, needs you, unknown, or failed, along with what the person actually said.
Built to be trusted
What you need
PhoneZero is a sample runtime with no product support. You’re responsible for calling laws and vendor terms where you use it, and nothing here is legal advice. See the disclaimer.
FAQ
PhoneZero is an open-source (MIT) runtime plus phone skills that enable voice-to-voice tasks in Grok Bot and Cursor. PhoneZero Operator is the Grok Bot template that sets it up and runs outbound calls.
When a call is the preferred way to reach someone, or when websites and other MCPs aren’t enough to finish the task, like completing a Japanese restaurant booking for a Tokyo trip, or confirming a dog policy that OpenTable didn’t list.
No. It plans first and waits for an explicit yes, then places one call and reports what a live person said.
A Telnyx account with KYC complete, a US phone number, and an API key; plus an xAI team API key with Zero Data Retention off and access to Voice Agent Builder at console.x.ai. The template walks you through setup on your own computer.
Yes. The same repository includes a Cursor plugin with commands such as /setup-phone-calling and /book-table.
Open the template on Grok and it will walk you through the rest.
Use PhoneZero on GrokAnother Grok Bot template
A personal housing investigator that runs the rules Zillow filters can’t: photos, rush-hour commutes, and the 2AM crime reality.