How-to
How to receive OTP and verification codes online
2 min readUpdated August 2, 2026
Quick answer
An OTP is a short-lived numeric code sent to prove you control a number. Receiving one online is straightforward; diagnosing why one did not arrive is where people lose an afternoon.
The procedure
- Check the service actually accepts your country. Our verification directory lists this per service.
- Rent a number from a mobile range in that country.
- Enter it in E.164 — the plus sign, the country code, then the national number with no leading zero.
- Request the code and watch the panel. Median delivery on our network is 21 seconds.
Why a code does not arrive
| Symptom | Likely cause | Fix |
|---|---|---|
| "Invalid number" | Wrong format, or the service rejects the range outright | Re-check E.164; try a different country |
| "Number already in use" | The line was recycled and a previous holder registered | Use a never-recycled pool |
| No error, no code | A2P filtering between the sender and the destination | Change destination country |
| Code arrives late | Aggregator queueing at peak | Request once and wait 2 minutes — repeats reset the timer |
Requesting the code five times in a row is the single most counterproductive response. Most services invalidate the earlier codes and start rate-limiting, so you end up waiting longer than if you had waited.
Services that will never send you one
Regulated financial institutions — PayPal, Revolut, Wise, retail banks — and government portals check the range against carrier databases and reject virtual allocations at signup. This is not a provider quality problem and no provider can solve it. We list these explicitly on our verification directory rather than take the sale.
Sources
Numbering-plan data on this page — dial code, national number length, trunk prefix and mobile ranges — is taken from the ITU-T E.164 series. Inventory, pricing and measured success rates are our own and are marked as such.
- ITU-T Recommendation E.164 — The international public telecommunication numbering plan · International Telecommunication UnionCountry calling codes, national significant number lengths, number structure
- ITU-T E.164 national numbering plans (Operational Bulletin annex) · International Telecommunication UnionPer-country numbering plans, mobile ranges, trunk prefixes
- ITU-T Recommendation E.123 — Notation for national and international telephone numbers · International Telecommunication UnionHow the example numbers on country pages are formatted
- ISO 3166-1 — Codes for the representation of names of countries · International Organization for StandardizationTwo-letter country identifiers used throughout this catalogue
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