Now Available

Give Your AI Agent a Phone Number

Provision phone numbers for AI agents with APIs for SMS, voice calls, and real-time audio streaming.

Built for

customer support

Get started in minutes. No credit card required.

AI Agent

Spenza

Customer

+1 (415) 555-0142

AI agents that can call, text, and talk.

Join 100+ companies using Spenza

Launch the mobile service your customers will love

Why Spenza

Built Different.
Built for AI.

Real phone numbers with guaranteed deliverability
Global phone number provisioning
Programmable SMS and voice APIs
Can be used as a data eSIM
Seamless number porting support
Numbers assigned by physical address

provision.ts

// Provision a number in one API call
const number = await spenza.numbers.create({
  country: "US",
  type: "local",
  capabilities: ["voice", "sms"],
  webhook: "https://ai.co/hook"
});

// → { number: "+14155550142",
//     status: "active" }

Countries

Coverage

0.9%

Uptime

Guaranteed SLA

0ms

Latency

Average response

Numbers

Provisioned

The Problem

AI Agents Need Phone Numbers

AI agents are increasingly handling customer support, scheduling, and sales conversations. But they can't interact with the largest communication network in the world — the phone system.

Spenza solves that. We provide virtual phone numbers designed for AI agents with APIs for voice and SMS.

Platform

Everything Your AI Needs

Three APIs. Infinite possibilities for AI communication.

AI Phone Numbers

Provision local or global numbers for AI agents. US, UK, EU, and 40+ countries available instantly via a single API call.

🇺🇸+1 (415) 555-0142

🇬🇧+44 20 7946 0958

🇩🇪+49 30 901820

🇯🇵+81 3-1234-5678

SMS API

Send and receive SMS messages programmatically. Two-way messaging with delivery receipts and webhook support.

Hi, your appointment is confirmed for 3PM tomorrow. Reply YES to confirm.

YES ✓

Real-Time Voice Streams

Receive live audio streams from calls using SIP or WebRTC. Feed directly to your LLM for real-time AI processing.

00:12

Live Stream Active

Integration

Three Steps. That's It.

Go from zero to AI-powered phone calls in minutes, not months.

Provision a Number

POST /api/v1/purchase-esim

Get a virtual phone number via a single API call. Choose from US, UK, EU, and 40+ countries.

Connect Your AI

POST /api/v1/webhook/register

Configure your webhook or SIP endpoint to receive call and SMS events in real time.

Your AI Talks to Humans

inbound → stream → respond

Inbound call triggers live audio stream via SIP or WebRTC. Your AI agent processes and responds.

Use Cases

Built for Agentic AI

Purpose-built for the next generation of AI-powered communication.

Customer Support

Handle inbound support calls 24/7 with natural AI conversation.

Sales Outreach

Automate outbound prospecting with voice AI that books meetings.

Appointment Scheduling

Book, confirm, and remind via phone calls and SMS.

Voice Assistants

Build voice-first AI products with real phone numbers.

Identity Verification

Phone-based identity verification and 2FA via voice or SMS.

Global Operations

Deploy AI agents with local numbers in 40+ countries.

Get Started