ChatGPT, OpenAI & Codex: Phone Verification with a Temporary Number

ChatGPT, the GPT models, Codex, the Codex CLI and the Codex app all sign in with the same OpenAI account. There is no separate phone check for each tool — the SMS verification happens once, when you create the OpenAI account. This guide shows how to pass that verification with a temporary number from jiema.my, then use the same account across every OpenAI product.

One OpenAI account for ChatGPT, GPT, Codex & the Codex CLI/app

Whether you open chat.openai.com for ChatGPT, call the GPT API, run Codex in the terminal via the Codex CLI, or use the Codex app, they all authenticate against your OpenAI account. So you only need to verify a phone number once — during account signup — and every tool inherits it.

Why OpenAI requires phone verification

OpenAI uses a one-time SMS code at signup to confirm a real person and block automated mass account creation. Be aware that OpenAI is stricter than most platformsabout VoIP and recycled numbers — some countries' pools verify reliably, others get rejected. Picking a country with a healthy, fresh number pool matters more here than for, say, Telegram.

Country picks

Because OpenAI filters hard, choose countries whose pools are deep and recently active. On jiema.my the live stock count is your best signal — a large pool usually means recent OpenAI activations are succeeding. These regions tend to work:

• Southeast Asia: Indonesia, Philippines, Vietnam
• Eastern Europe: Poland, Romania, Ukraine
• Latin America: Brazil, Mexico

If one number is rejected, cancel within the window for a full refund and try another country.

Step-by-step: verify your OpenAI account

1. Start the OpenAI / ChatGPT signup at chat.openai.com with your email, until it asks for a phone number.
2. On jiema.my, open the OpenAI service, pick a country and place the order. The temporary number appears on your order page instantly.
3. Enter that number into OpenAI's phone field and request the SMS code.
4. The code arrives on your jiema.my order page within seconds — copy it and enter it on OpenAI.
5. Your OpenAI account is now verified. The temporary number is no longer needed.

Using Codex, the Codex CLI & Codex app after verification

Once the OpenAI account is verified, sign in to Codex, the Codex CLI (codex login in your terminal) or the Codex app with that same account — no second SMS is required. The phone step is a one-time account gate, not a per-tool check.

Frequently asked questions

Do Codex, Codex CLI or Codex app need their own phone verification?

No. They authenticate with your OpenAI account. Verify the account once with a temporary number, then log in to any Codex tool normally.

Why was my number rejected by OpenAI?

OpenAI aggressively filters VoIP and reused numbers. Cancel the order within the 15-minute window for an automatic refund, then try a different country with a larger live stock count.

How long is the number active?

An SMS order on jiema.my stays active for 15 minutes. No code in that window means an automatic refund — so a rejected attempt costs you nothing.

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