By receive-sms.app · Based on how this directory collects and displays public SMS.
If you entered a free number and no code appeared, the cause is almost always one of five things. They are worth knowing in order, because the fixes are very different.
1. The number has stopped receiving
A public number that worked last week may no longer receive messages. We label numbers Live when a message was observed within one hour, Slow within one day, and Archive when activity is older or unknown. Archive does not prove the line is disconnected, but a number with recent activity is a better starting point.
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2. The service refuses shared or virtual numbers
Many large services detect that a number belongs to a bulk SMS provider and silently decline to send to it. You will usually see the request appear to succeed with no message ever arriving. WhatsApp, Telegram and some banks are strict about this; smaller sites and one-off sign-ups are far more permissive.
3. Someone already registered that number
These numbers are shared, so a popular one has often been used for the same service already. The service then treats it as an existing account rather than a new sign-up. Trying a different number — ideally one with fewer messages — usually resolves it.
4. The code arrived and scrolled away
A busy number can receive several messages a minute. If yours landed while other traffic was coming in, it may be further down the list. Use the search box on the number's page to search its full history for the sender name or part of the message.
5. You are waiting on the wrong country
Some services only send to numbers in the country the account is registered in, and will refuse a foreign number outright. Choose a number from the country the service expects.
How long should you actually wait?
Delivery and collection delays vary. Follow the sending service's resend timer and avoid repeated requests, which may trigger rate limits. If no message appears, check the number's latest activity and the service's error message before trying another number.