Codex SMS Verification (US Numbers)
Codex runs on the same OpenAI account as ChatGPT: a number is required at sign-up, and a second check often appears when you log in from a new device or a new location.
sms688 rents real US T-Mobile lines (non-VoIP). Pick a tier, enter the number in Codex, and read the code from your own private link - no app to install.
Codes usually arrive in under a minute and sync automatically to your SMS center. If a code never arrives, swap the number instead of paying twice.
Open the marketContact supportWhat you get
- Real US carrier numbers that OpenAI accepts far more often than VoIP ranges.
- Tiers from 2 to 30 days, so the same line can answer a later login challenge.
- Swap the number when nothing arrives; monitored prefixes keep delivery healthy.
How it works
- Pick a tier — Buy a Codex / OpenAI number in the marketplace - choose 21-30 days if the account will be reused.
- Enter the number — On the Codex or ChatGPT sign-up page select United States (+1) and type the number.
- Read the code — The SMS lands on your private link and in the SMS center, usually within a minute.
- If it fails — Pull the latest message first, switch to a cleaner US node, then request a replacement number.
Live prices
| Project | Tier | Price | Stock |
|---|---|---|---|
| OpenAI / ChatGPT | 2-10 days | 0.150 USDT | 18,139 |
| OpenAI / ChatGPT | 11-20 days | 0.200 USDT | 14,134 |
| OpenAI / ChatGPT | 21-30 days | 0.300 USDT | 1,182 |
| Claude | 2-9 days | 0.100 USDT | 30,513 |
| Claude | 10-20 days | 0.150 USDT | 20,480 |
| Claude | 21-30 days | 0.200 USDT | 1,888 |
| Google Voice | 2-30 days | 0.225 USDT | 1,834 |
| TikTok | 2-4 days | 0.075 USDT | 7,235 |
| TikTok | 5-15 days | 0.075 USDT | 44,050 |
| TikTok | 16-30 days | 0.120 USDT | 2,444 |
| 2-92 days | 0.150 USDT | 5 | |
| Wise | 2-30 days | 0.450 USDT | 54,639 |
Prices and stock refresh from the live market every day. Full list: all services and tiers.
FAQ
Does Codex require a phone number?
Yes - new OpenAI / Codex registrations normally need one SMS verification, and later logins from a new device can trigger another.
Should I use a free number for Codex?
Free public pools are reused by thousands of people and OpenAI blocks most of them. A fresh carrier number is far more reliable.
How long do I need the number?
2-10 days covers a single sign-up; take 21-30 days when the same line must answer later login checks.
What if the SMS never arrives?
Pull the latest message in the SMS center, retry from a different US node, and swap the number if the line never received anything.
Related pages
OpenAI / ChatGPT Phone VerificationUS SMS Verification NumbersLong-Term US Number Rental