What “this phone number cannot be used for verification” means

What each message means, and what the app says to do

Google and Claude publish their exact wording. Discord’s help page names each error. For the rest, the row describes what the app’s help page says, since the on-screen wording isn’t published.

Why apps refuse some types of number is explained in why apps reject VoIP numbers, and what each app says about types is in our table of app policies.

What to try, in order

1. Look for a wait in the message

   A message that says the number was used recently, or to try later, is a timeout rather than a refusal. Wait the time it gives (Discord asks for 24 to 48 hours) and don’t keep retrying: Microsoft warns that repeated attempts can reset a time lock.

2. Check how you typed the number

   Discord’s “Invalid phone number” covers a number entered wrongly as well as one it won’t use. Check the country selected and that the +1 isn’t doubled; the US number formatter shows which form a box wants.

3. Free it from your other account

   If the number is on another account of yours, release it there. Microsoft has you remove it from the old account first. Claude unlinks a number if you contact Support from one of the accounts. TikTok lets a deleted account’s number be used again after 30 days.

4. Use the app’s other way in

   Some apps don’t need a phone for sign-up. X suggests creating the account with an email address if a new number won’t work, and Facebook lets you sign up with email instead.

5. Then use a different number

   This is Google’s and Claude’s own advice for their errors. OpenAI puts it as another supported mobile number you control.

When a different number helps, and when it doesn’t

A different number helps when the refusal is about the number: its type, the accounts it has already verified, or a timeout on it. It doesn’t help when the limit follows you, your device or your account, and some apps say so outright:

• Snapchat’s SS07 error means too many accounts have been tied to the device, and SS06 and SS18 mean the device is banned.
• Steam treats accounts that share a number as one identity, and a VAC or game ban can extend to all of them.
• Claude requires you to be physically in a supported location as well as to have a number from one.

A new number changes none of those, and using one to get around a limit or a ban breaks the app’s terms and our acceptable use policy.

A rented number, ours included, faces the same checks as any other, and it may have had an earlier holder. Ours are non-VoIP, which is not the type the VoIP rules name, but the other checks still apply. If an app refuses one, you can cancel it within 24 hours as long as no text has arrived. If there was no error, only no code, the missing-code checklist is the page you need.

Questions people ask

Will waiting fix “this phone number cannot be used for verification”?

Not for Google’s message: Google’s fix is a different number. Waiting helps only when an app says the number is in a timeout, as Discord does for a recently used number, which it asks you to leave for 24 to 48 hours.

How many times can a phone number be used for Google verification?

Google doesn’t publish the figure. Its help page says only that it limits how many times a number can be used for verification, and that if you see the error you should use a different number.

Why is my own mobile number refused?

An app can refuse a number you have had for years if it has already verified other accounts, was used recently, or is classed as VoIP by the app’s own check, which can happen to a number on an ordinary phone plan.

Can I unlink my number from an old account to use it again?

Often, yes. Microsoft asks you to remove it from the old account first, Claude unlinks it if you contact Support from one of the accounts, and TikTok lets a deleted account’s number be used on a new account after 30 days.

Does a rented number avoid this error?

Only if the refusal was about your old number. A rented number faces the same type checks and per-number limits as any other and may have had an earlier holder, and it does nothing about a limit on your device or account.