Signing up for OpenAI, Claude, Gemini and other AI services with a temporary number

Almost every consumer-facing AI service asks for a phone number now — OpenAI for ChatGPT and the API console, Anthropic for Claude (web and console), Google for Gemini, Perplexity for Pro, plus image generators and various agents. The verification step is usually a one-off SMS, which is exactly the case temporary numbers are built for. A few notes from real registrations.

Country picks that tend to work

AI signups don't generally care which country your number comes from, but operators in some regions deliver more reliably than others. As of writing, three groups behave well across most services:

• Southeast Asia: Indonesia, Philippines, Vietnam, Malaysia.
• Latin America: Brazil, Mexico, Colombia, Argentina.
• Eastern Europe: Poland, Romania, Bulgaria, Ukraine.

Avoid US numbers for AI signups when possible — they get blocked first during anti-abuse sweeps because the bulk of automated registration attempts originate there.

The non-VoIP quirk

Some providers (notably older OpenAI flows) have rejected numbers they fingerprint as VoIP/virtual. Our pool is real mobile SIMs from real operators, so this is rarely an issue, but if you hit "this looks like a virtual number" specifically, cancel and try a different country — the rejection is per-prefix.

Service codes that map to AI products

In our catalog these are the relevant entries — the upstream codes are short and don't always look like the brand:

• OpenAI / ChatGPT: service code dr (in upstream listings).
• Claude / Anthropic: service code acz.
• Google Gemini: service code anj. Note: Gemini sometimes shares verification with general Google accounts (go); if one doesn't deliver, try the other.
• Perplexity: the platform reuses Google verification more often than not — Google go usually works.

You don't need to memorise codes — they're just URL slugs. Search "Claude" or "Gemini" on the browse page and pick the matching tile.

Set up TOTP immediately

The single biggest mistake new users make: signup with a temporary number, get logged in, forget to set up a long-term second factor, then the verification number disappears, the AI account flags suspicious login, and there's no recovery path. Walk through the security settings on day one:

1. Open the AI account's security or 2FA settings.
2. Add an authenticator app (TOTP) and save the seed in your password manager.
3. Save the recovery codes alongside it.
4. Now if you change phone, browser, or wifi country, the account still recognises you.

What if the platform asks again later

AI services occasionally re-verify (after a long absence, after a suspicious login, when you upgrade to paid tier). Once your temporary number is gone, you can't receive a fresh SMS to it. Plan ahead:

• If your account has TOTP set up, re-verification will usually offer that path instead.
• For paid upgrades, most platforms accept any working card billing address regardless of phone country.
• If you're really committed to the account, a personal SIM (or a long-rental virtual number from a different provider) on the same account at a calm moment is the safest belt-and-braces.

What temporary numbers don't help with

They don't bypass region restrictions on AI products themselves. If Gemini Advanced isn't rolled out in your country, a phone number from a launched country doesn't unlock the product — your IP, billing region, and (sometimes) account language settings matter more. Temporary numbers solve the verification step; the rest of the access story is its own problem.