AgentPhone Telephony/messaging infrastructure for AI agents: gives any AI agent its own real phone number to place calls and send/receive texts (SMS, WhatsApp, RCS, iMessage) via a single API/webhook. Co-founded by brothers Manav Modi (CEO, BS Computer Engineering UIUC, prior growth work on Vogue's app) and Meet Modi (CTO, BS Computer Science & Linguistics UCLA, previously built WhatsApp AI-agent infrastructure at Meta for 280M+ businesses). YC Spring 2026 (S26) batch. NOTE: Perceptive Ventures' own portfolio page lists this as a portfolio company, but independent sources name Rebel Fund and Pioneer Fund as investors — the Perceptive relationship is unconfirmed, flagged rather than asserted.