How to Assign a Real Phone Number to an AI Agent for SMS & 2FA

Purchase a SecondSim Standard Plan. Once payment goes through, the team dashboard issues an SM-DP+ activation address and an eSIM activation code. This credentials bundle acts as your agent's unique telecom signing key.

Activate the eSIM on an LTE/5G development modem (like a Sierra Wireless or Telit module hooked to your server cluster) or route incoming messages through a secure SMS forwarding app on a dedicated developer handset. The goal is to funnel incoming SMS packets programmatically to your backend API.

Configure your listener endpoint to forward SMS body payloads to your LLM agent's prompt context. Below is a sample Python architecture demonstrating how the agent catches the webhook, uses a regex to isolate the 6-digit OTP code, and returns it autonomously:

import re
from fastapi import FastAPI, Request

app = FastAPI()

@app.post("/sms/webhook")
async def handle_incoming_sms(request: Request):
    data = await request.json()
    sms_content = data.get("message", "")
    
    # Isolate OTP code (typically 6 digits)
    otp_match = re.search(r'\b\d{6}\b', sms_content)
    if otp_match:
        otp_code = otp_match.group(0)
        # Dispatch code back to the waiting CrewAI or LangChain runner
        await trigger_agent_input_verification(otp_code)
        return {"status": "success", "otp_extracted": otp_code}
    
    return {"status": "ignored"}