Phone Verification: Why Apps Ask for Your Number

Phone verification is the step where an app sends a code to your number to prove you are a real person who has that phone. Apps use it to stop spam and to help you recover the account.

Why apps verify phone numbers

• A phone number costs money, so it limits fake and bulk accounts.
• It gives the app a way to reach you about security.
• It is a backup for passwords and two-factor.
• Some apps use it to show you contacts who also use the app.

What apps check

Before sending a code, many apps look up the number's carrier and line type. Mobile numbers pass; VoIP numbers and numbers seen on many accounts are often refused. Read VoIP vs non-VoIP for how the check works.

Keeping your number private

• Use email sign-in where the app offers it.
• Hide your number in the app's privacy settings.
• Use a second number you control for apps you do not trust; see temporary numbers for verification.

What happens to your number afterwards

• It becomes a sign-in and recovery method.
• Some apps use it to suggest contacts; turn that off in privacy settings.
• It may be used for security alerts and, if you agree, marketing texts.

Changing the number on your accounts

When you change numbers, update email, banking and social accounts first, while the old number still works. An old number left on an account can later belong to someone else.

FAQ

Is phone verification safe?

Yes, but your number becomes part of the account, so keep it current.

Can I skip phone verification?

Some apps let you use email instead; others require a number.

Why does an app say my number is not supported?

It is often a VoIP number or used on too many accounts.

Can I use a different number for verification?

Yes, any real number you can read the code on; rent it if the app will ask again.

Do apps sell my phone number?

Their privacy policies say how they use it; many use it for ads matching unless you opt out.

What if I lose the number on file?

Use email or backup codes to sign in, then update it.

Related: temporary phone number for verification · VoIP vs non-VoIP · verification code not received on any app.