OpenAI/ChatGPT Registration Guide: Complete Virtual Number Tutorial

2026-06-24 · OmniSMS AI

Introduction

As ChatGPT and OpenAI API gain worldwide popularity, more users want to register an OpenAI account to access GPT-4o, DALL·E, and other powerful features. However, OpenAI enforces strict phone verification during registration, and many users encounter "This number cannot be used for verification" errors. This guide walks you through the complete OpenAI/ChatGPT registration process and shows how to use OmniSMS virtual numbers to complete OpenAI SMS verification smoothly.

Why OpenAI Requires Phone Verification

OpenAI implements phone verification for several reasons:

1. Prevent abuse and mass account creation: Phone verification is OpenAI's primary defense against spam and fraudulent accounts.
2. Regional compliance: Different countries have different AI service access policies, and phone numbers help determine user location.
3. Account security: A verified phone number enables password recovery and account restoration.
4. Anti-fraud measures: OpenAI actively detects and blocks VoIP and recycled virtual numbers, which is why you need a reliable service for OpenAI phone verification.

OpenAI/ChatGPT Registration Step-by-Step

Step 1: Visit the Website

Open your browser and navigate to chat.openai.com. Click "Sign up". You can use Google, Microsoft, or Apple accounts for quick login, or register with your email.

Step 2: Fill in Basic Information

Enter your email address and create a password (minimum 12 characters with mixed case, numbers, and special characters).

Step 3: Email Verification

OpenAI sends a verification email — click the link to confirm. This step is usually instant.

Step 4: Phone Verification — The Critical Step

After email verification, OpenAI asks for a phone number to receive an SMS code. This is where most users get stuck in the OpenAI registration guide.

If your country's number isn't supported or your phone is already linked to another account, you'll need a virtual number service for OpenAI SMS verification.

Step 5: Set Up Your Profile

Once verified, set your name, avatar, and usage scenario (personal, developer, business) to enter ChatGPT.

Receiving OpenAI Verification Code with OmniSMS

OmniSMS provides virtual numbers across 180+ countries, specifically designed to solve OpenAI phone verification challenges.

1. Register and Top Up

Sign up at OmniSMS and add funds. Pricing is pay-per-use with a low minimum — you only pay for what you use.

2. Select OpenAI Service

Choose OpenAI/ChatGPT from the service list. OmniSMS will assign an available virtual number maintained specifically to receive OpenAI verification codes.

3. API Integration Example

import requests
import time

# OmniSMS API Configuration
API_KEY = "your_omnisms_api_key"
BASE_URL = "https://api.omnisms.com/v1"

# 1. Get an available OpenAI number
def get_openai_number():
    url = f"{BASE_URL}/numbers/available"
    params = {
        "service": "openai",
        "country": "auto"
    }
    headers = {"Authorization": f"Bearer {API_KEY}"}
    resp = requests.get(url, params=params, headers=headers)
    data = resp.json()
    return data["phone_number"]

# 2. Wait for SMS verification code
def wait_for_sms(phone_number, timeout=300):
    url = f"{BASE_URL}/sms/wait"
    params = {
        "phone": phone_number,
        "service": "openai",
    }
    headers = {"Authorization": f"Bearer {API_KEY}"}

    start = time.time()
    while time.time() - start < timeout:
        resp = requests.get(url, params=params, headers=headers)
        data = resp.json()
        if data.get("code"):
            return data["code"]
        time.sleep(3)
    return None

# 3. Complete flow
phone = get_openai_number()
print(f"Assigned virtual number: {phone}")
print("Enter this number on the OpenAI registration page and click Send Code...")

code = wait_for_sms(phone)
if code:
    print(f"Verification code received: {code}")
else:
    print("Timeout. Please check the number status.")

4. Enter the Number on OpenAI

Paste the virtual number into OpenAI's phone input field, click "Send code", and the code will appear in your terminal within 30-60 seconds.

FAQ & Troubleshooting

Q1: Why does it say "This number cannot be used"?

This happens when the number is flagged as virtual or has been used for abuse. Solution: Use a professionally maintained service like OmniSMS instead of free public platforms.

Q2: Verification code taking too long?

Wait 30-60 seconds. If it exceeds 2 minutes, release the current number and request a new one. OmniSMS supports one-click number replacement.

Q3: Can one number be used for multiple accounts?

No. Each OpenAI account needs a unique number for OpenAI phone verification.

Q4: Can I change my phone number after registration?

Yes, OpenAI settings allow changing the linked number, but the new number must pass SMS verification too.

Q5: Can users in restricted countries register?

Yes. Get an international virtual number through OmniSMS and follow the OpenAI registration guide above.

Conclusion

Phone verification is an unavoidable step in the OpenAI/ChatGPT registration process. With OmniSMS virtual numbers, you can complete OpenAI SMS verification quickly and access all of ChatGPT's features. Whether you're a casual user or a developer, OmniSMS provides reliable verification code reception service.