Verification Codes

How one-time codes work, why they fail to arrive, and how to receive SMS and call verification codes on a real second number.

• Not Receiving Verification Codes? Fixes That Work — Verification code not arriving? Most cases come down to a typo, a filter, a carrier block or a rate limit. Work through these fixes in order and get the code through.
• Phone Number for Verification: How to Pick One That Works — The right phone number for verification is real, private, yours for the long run and able to take calls. Compare your options and match the number to the account.
• Free "Receive SMS Online" Sites: Why Codes Fail and the Risks — Free "receive SMS online" sites show every incoming code on a public page. Here's why their codes so often fail, what can go wrong with your account, and what to use instead.
• Verification Codes by Phone Call: How Voice OTP Works — Some apps read your one-time code out loud in an automated call instead of texting it. Here's why, how to ask for a call, and what to check if it never rings.
• How to Use WhatsApp Without Your Personal Number — WhatsApp needs a phone number, but it doesn't have to be your personal one. Register it on a real second number, lock down your privacy settings, and keep the account safe.
• How to Receive Verification Codes Without Giving Out Your Real Number — One-time codes are everywhere — but you don't have to share your personal number to get them. Here's how to receive verification codes on a second number.