VoIP Verification Checker
Is your virtual number blocked? Search our database to see which services block VoIP numbers and find out why.
Monzo
Banking
Requires Real SIM
Exact Error Message:
Sorry, there was a problem. Please contact us.
Starling Bank
Banking
Requires Real SIM
Exact Error Message:
This number is not supported.
Revolut
Banking
Often Flagged
Exact Error Message:
We could not verify your number. Please try another.
HSBC UK
Banking
Requires Real SIM
Exact Error Message:
Code not received / System Error 085
Barclays
Banking
Requires Real SIM
Exact Error Message:
Error 00002 / Mobile number does not match records.
Lloyds Bank
Banking
Often Flagged
Exact Error Message:
We cannot send a code to this number.
Santander UK
Banking
Requires Real SIM
Exact Error Message:
One Time Passcode (OTP) service is not available.
NatWest
Banking
Requires Real SIM
Exact Error Message:
Activation code not received.
Chase UK
Banking
Requires Real SIM
Exact Error Message:
Something went wrong. Please try again later.
First Direct
Banking
Requires Real SIM
Exact Error Message:
We can't verify this device.
TSB
Banking
Often Flagged
Exact Error Message:
We are unable to send an OTP to this number.
Metro Bank
Banking
Requires Real SIM
Exact Error Message:
Please visit a branch to update your details.
Halifax
Banking
Often Flagged
Exact Error Message:
We can't send you a code right now.
Wise (TransferWise)
Banking
Often Flagged
Exact Error Message:
We're having trouble sending your code.
Monese
Banking
Requires Real SIM
Exact Error Message:
We couldn't verify your phone number.
PayPal
Payment
Requires Real SIM
Exact Error Message:
We're sorry, we can't use this number.
Venmo
Payment
Requires Real SIM
Exact Error Message:
Invalid phone number.
Cash App
Payment
Often Flagged
Exact Error Message:
We could not sign you in.
Coinbase
Crypto
Requires Real SIM
Exact Error Message:
VoIP numbers are not supported for 2FA.
Binance
Crypto
Often Flagged
Exact Error Message:
Verification code limit exceeded.
Crypto.com
Crypto
Requires Real SIM
Exact Error Message:
Invalid phone number format.
Kraken
Crypto
Requires Real SIM
Exact Error Message:
Invalid phone number.
Gov.uk (HMRC)
Gov
Requires Real SIM
Exact Error Message:
Access Code not received.
NHS App
Gov
Requires Real SIM
Exact Error Message:
We could not match your details.
GOV.UK One Login
Gov
Requires Real SIM
Exact Error Message:
We cannot send a code to this number.
Claude (Anthropic)
AI
Requires Real SIM
Exact Error Message:
Error sending code. Please try a different number.
OpenAI (ChatGPT)
AI
Requires Real SIM
Exact Error Message:
Suspicious activity detected from this number.
Bet365
Gambling
Requires Real SIM
Exact Error Message:
Please contact us to verify your location.
William Hill
Gambling
Requires Real SIM
Exact Error Message:
Mobile number not recognised.
Amazon Seller
Retail
Requires Real SIM
Exact Error Message:
Internal Error / OTP not received.
Etsy
Retail
Often Flagged
Exact Error Message:
Your shop is in Holiday Mode.
eBay
Retail
Requires Real SIM
Exact Error Message:
Please provide a valid mobile number.
Ticketmaster
Retail
Requires Real SIM
Exact Error Message:
VoIP or Landline numbers are not accepted.
Nike SNKRS
Retail
Requires Real SIM
Exact Error Message:
Please enter a valid mobile number.
Adidas Confirmed
Retail
Requires Real SIM
Exact Error Message:
Something went wrong.
Gumtree
Retail
Requires Real SIM
Exact Error Message:
Please enter a valid mobile number.
Vinted
Retail
Often Flagged
Exact Error Message:
Invalid phone number.
Depop
Retail
Often Flagged
Exact Error Message:
Something went wrong.
Tesco Clubcard
Retail
Often Flagged
Exact Error Message:
Code not received.
WhatsApp Business
Social
Requires Real SIM
Exact Error Message:
Is not a valid mobile number for this country.
Telegram
Social
Often Flagged
Exact Error Message:
Phone number banned.
Signal
Social
Often Flagged
Exact Error Message:
Network error.
TikTok
Social
Often Flagged
Exact Error Message:
This number is already registered.
Twitter / X
Social
Requires Real SIM
Exact Error Message:
Unsupported phone number.
Social
Often Flagged
Exact Error Message:
We restricted certain activity.
Social
Requires Real SIM
Exact Error Message:
Registration failed due to suspicious environment.
Nextdoor
Social
Requires Real SIM
Exact Error Message:
We can't verify this phone number.
Tinder
Dating
Often Flagged
Exact Error Message:
Problem getting your code.
Bumble
Dating
Often Flagged
Exact Error Message:
Invalid verification.
Hinge
Dating
Requires Real SIM
Exact Error Message:
You've been banned.
Battle.net (Blizzard)
Gaming
Requires Real SIM
Exact Error Message:
Please enter a post-paid phone number.
Steam
Gaming
Requires Real SIM
Exact Error Message:
VoIP numbers are not supported.
Faceit
Gaming
Requires Real SIM
Exact Error Message:
Verification Failed. Phone type not supported.
Roblox
Gaming
Often Flagged
Exact Error Message:
Verification failed.
Discord
Gaming
Often Flagged
Exact Error Message:
Invalid phone number.
Uber (Driver)
Gig
Requires Real SIM
Exact Error Message:
This type of phone number is not supported.
Deliveroo
Gig
Requires Real SIM
Exact Error Message:
Verify your identity to go online.
Airbnb
Travel
Often Flagged
Exact Error Message:
We couldn't verify your phone number.
AWS (Amazon Cloud)
Cloud
Often Flagged
Exact Error Message:
We could not verify your phone number.
Google Cloud
Cloud
Requires Real SIM
Exact Error Message:
This phone number cannot be used for verification.
Microsoft Azure
Cloud
Requires Real SIM
Exact Error Message:
We cannot verify your identity.
What is a VoIP Number?
Voice over Internet Protocol (VoIP) numbers transmit calls over the internet rather than traditional phone lines. While popular for their low cost and flexibility, they lack a Mobile Network Code (MNC)—a unique identifier tied to physical SIM cards.
Because anyone can generate a VoIP number anonymously (often for free), they are frequently used by scammers and bots. This is why many platforms now automatically detect and block them.
Why Do Services Block VoIP Numbers?
Services like Tinder, WhatsApp, and PayPal need to verify that you are a real person. They use mobile verification to prevent:
- Fraud: Creating multiple fake accounts / bot farms.
- Spam: Sending mass messages or scams.
- Anonymity: Evading bans or legal accountability.
When you enter a number, their API checks the carrier database. If it flags as "Non-Fixed VoIP" (like Google Voice, Skype, or Burner apps), the verification SMS is never sent.
The Solution: Use a Real Mobile Number
To bypass these blocks, you need a number with a valid Mobile Network Code. SecondSIM provides real UK mobile numbers that register as physical SIMs, ensuring you receive OTP codes every time.
Get a Verifiable NumberFrequently Asked Questions
Why am I not receiving verification codes?
If you are using a virtual number app, it's likely being blocked by the service. Platforms classify these as "VoIP" or "Non-Fixed VoIP" and silent-block SMS capabilities to prevent spam. You need a regular mobile number to receive these codes.
Can I bypass VoIP blocklists?
You cannot "bypass" the detection itself as it queries the number's carrier directly. The only working method is to use a number issued by a legitimate mobile network operator (MNO) rather than a VoIP provider.
Is SecondSIM a VoIP number?
No. SecondSIM provides real UK mobile numbers with valid Mobile Network Codes. They function exactly like a standard SIM card in your phone, making them compatible with almost all services that block VoIP.