AI agents have a fundamental identity problem in the real world: without a phone number, they cannot meaningfully call businesses, send appointment confirmations, receive SMS verifications, or reach customers the way humans do. AgentPhone solves this by giving every AI agent its own dedicated phone number with voice and messaging built in, exposed through a single developer API and unified webhook — no Twilio-style stitching, no carrier compliance headaches, no separate stacks for SMS, voice, RCS, iMessage, or WhatsApp.
Developers provision a number in seconds, then route inbound and outbound voice calls and messages through one consistent interface their agent can consume. AgentPhone handles A2P registration, spam scoring, message threading across channels, and call control primitives like transfers, recordings, and DTMF. The platform is designed for agent frameworks rather than human call centers, so it ships SDK integrations and webhook patterns optimized for LLM-driven workflows where an agent needs to decide in real time whether to call, text, or escalate.
Founded in 2026 by brothers Meet and Manav Modi as part of YC's Spring 2026 (P26) batch, AgentPhone is built on serious infrastructure experience: Meet previously built AI agent infrastructure on WhatsApp serving 280M+ businesses at Meta, and Manav drove the Vogue app revamp from ~100K to 1M+ users. Early adopters already include teams at Google's Agent Development Kit, Replit, Y Combinator itself, Sim AI, LangChain, and Alchemy.