AgentCall is the phone number API built for AI agents. Every agent eventually hits a wall — SMS verification, 2FA, OTP extraction, and voice calls all require a real number. With AgentCall, provision real SIM-backed numbers in seconds, send/receive SMS, make voice calls, and auto-extract OTPs — all via a clean REST API. Works with Vapi, Bland, Retell, and any agent stack. Free tier available.