Free sites to receive SMS online: the risks of a public number

Free “receive SMS online” sites list phone numbers and show every text those numbers get on a public page. Type one into an app, refresh the page, and the code appears. It costs nothing, and for a throwaway sign-up that can be fine. For an account you care about, three things can go wrong.

Anyone can read your code

The inbox is public, so everyone who opens the page sees the same messages you do, including the code that confirms your account. Later, anyone who knows which account used the number can ask the app for a sign-in or password reset code and read it on the same page.

Most apps have already seen those numbers

Public numbers are used for thousands of sign-ups. Apps notice, and many stop sending codes to them or refuse them outright. Google, for example, can answer with “This phone number cannot be used for verification”. That’s why a free number often sends you round in circles.

The account stays tied to a number you don’t control

Your account keeps the number after you sign up. If the app uses it for recovery or two-step sign-in, it’s sending your codes to a page anyone can read, possibly for years.

When a free number is fine

For a one-off trial or a test account you’ll never use again, with no payment details and nothing personal in it, a public number does the job, if the app accepts it.

What a private number changes

A private number is held for you alone: the code shows up on your order page and nobody else sees it. Ours are $1 a number, paid from your balance, and if no SMS arrives within 20 minutes the money goes back to your balance.

A one-time number still stops receiving texts after its window. So whichever kind you use, finish with the steps in keeping an account after a temporary number: add an email, and switch two-step sign-in to an authenticator app.