Introduction

ReachCell is a real-SIM-backed phone API for AI agents and automation workflows. It provides real carrier phone numbers that pass verification checks VoIP numbers cannot, in countries where other providers do not offer coverage.

Core capabilities

• SMS messaging — two-way SMS through real carrier numbers.
• Call detection — trigger outbound calls and detect inbound calls via webhooks. Call events (ring, answer, missed, hangup) are delivered to your endpoint. No live voice streaming — calls are used for signal, not audio relay.
• WhatsApp-capable numbers — real SIM numbers registered on WhatsApp Business.

Call verification use cases

• Inbound missed-call verification — give customers your number. When they call, a call.incoming then call.missed webhook fires. Use the signal to verify the number at zero cost to the caller.
• Outbound missed-call delivery — trigger a call to a customer. They see your number on their screen. Receive confirmation via call.connected or call.missed webhook. No answer required.

Architecture

Commands are sent to the ReachCell REST API, relayed in real time through real Android devices with carrier SIM cards, and executed on the cellular network. Status updates and inbound messages flow back to you via the API and webhooks.

Prerequisites

• A ReachCell account — register here.
• Completed identity verification (KYC).
• At least one provisioned phone number.
• An API key (created in the developer portal).