VoIP Verification Checker
Is your virtual number blocked? Search our database to see which services block VoIP numbers.
Stop failing verification and get a real UK mobile eSIM instead.
Co-operative Bank
Banking
Requires Real SIM
Exact Error Message:
We are unable to verify this mobile number. Please use a UK mobile network.
Nationwide
Banking
Requires Real SIM
Exact Error Message:
Sorry, we couldn't verify your number. Call us to proceed.
Virgin Money
Banking
Requires Real SIM
Exact Error Message:
Invalid mobile number. Please try again.
Bank of Scotland
Banking
Often Flagged
Exact Error Message:
We can't send you a code right now.
Royal Bank of Scotland
Banking
Requires Real SIM
Exact Error Message:
Activation code not received.
Coutts
Banking
Requires Real SIM
Exact Error Message:
Please contact your private banker to update your security details.
Triodos Bank
Banking
Often Flagged
Exact Error Message:
SMS delivery failed.
Kroo
Banking
Requires Real SIM
Exact Error Message:
Your number must be from a supported mobile network.
Algbra
Banking
Requires Real SIM
Exact Error Message:
Verification failed. Please use a standard mobile number.
Curve
Banking
Requires Real SIM
Exact Error Message:
We couldn't send a code to that number.
Pockit
Banking
Often Flagged
Exact Error Message:
Mobile number not accepted.
Suits Me
Banking
Requires Real SIM
Exact Error Message:
Please enter a valid UK mobile number.
Mettle
Banking
Requires Real SIM
Exact Error Message:
We only support standard mobile numbers for security.
Tide
Banking
Requires Real SIM
Exact Error Message:
We could not verify your device. Please try a different number.
ANNA Money
Banking
Requires Real SIM
Exact Error Message:
Number validation failed.
Cashplus
Banking
Often Flagged
Exact Error Message:
Please provide a valid mobile number.
Countingup
Banking
Requires Real SIM
Exact Error Message:
Authentication SMS could not be delivered.
Plum
Finance
Requires Real SIM
Exact Error Message:
Please enter a valid mobile number.
Chip
Finance
Often Flagged
Exact Error Message:
We couldn't verify your number.
Moneybox
Finance
Requires Real SIM
Exact Error Message:
Verification code failed to send.
Zing
Finance
Requires Real SIM
Exact Error Message:
Number not supported.
Klarna
Credit Services
Requires Real SIM
Exact Error Message:
We couldn't verify your details. Please try another number.
Clearpay
Credit Services
Often Flagged
Exact Error Message:
Invalid phone number format.
Laybuy
Credit Services
Often Flagged
Exact Error Message:
SMS verification failed.
Zilch
Credit Services
Requires Real SIM
Exact Error Message:
Please use a valid mobile number.
Experian
Credit Services
Requires Real SIM
Exact Error Message:
We could not verify your identity with this number.
Equifax
Credit Services
Requires Real SIM
Exact Error Message:
Number verification error.
TransUnion
Credit Services
Requires Real SIM
Exact Error Message:
Security code could not be sent.
ClearScore
Credit Services
Often Flagged
Exact Error Message:
We could not link this number to your file.
Credit Karma
Credit Services
Requires Real SIM
Exact Error Message:
Phone number is VOIP or invalid.
Just Eat
Gig Worker / Delivery
Requires Real SIM
Exact Error Message:
Phone number not accepted for courier registration.
Stuart Delivery
Gig Worker / Delivery
Requires Real SIM
Exact Error Message:
Please provide a valid standard mobile number.
Amazon Flex
Gig Worker / Delivery
Requires Real SIM
Exact Error Message:
Error: Phone number is virtual.
Bolt
Gig Worker / Delivery
Often Flagged
Exact Error Message:
We could not send a confirmation code.
FreeNow
Gig Worker / Delivery
Often Flagged
Exact Error Message:
Number not valid for driver registration.
Gopuff
Gig Worker / Delivery
Requires Real SIM
Exact Error Message:
Please enter a valid mobile number.
Getir
Gig Worker / Delivery
Requires Real SIM
Exact Error Message:
Invalid phone number.
Ryde
Gig Worker / Delivery
Often Flagged
Exact Error Message:
SMS delivery error.
TaskRabbit
Gig Worker / Delivery
Requires Real SIM
Exact Error Message:
Virtual numbers are not permitted.
DVLA
Government / Services
Often Flagged
Exact Error Message:
We are unable to send an SMS to this number.
Universal Credit
Government / Services
Requires Real SIM
Exact Error Message:
Please provide a UK mobile network number.
Companies House
Government / Services
Often Flagged
Exact Error Message:
Authentication failed.
Royal Mail
Government / Services
Often Flagged
Exact Error Message:
Invalid mobile number format.
OkCupid
Dating apps
Requires Real SIM
Exact Error Message:
Please enter a valid mobile number.
Zoosk
Dating apps
Often Flagged
Exact Error Message:
Could not send verification code.
Plenty of Fish
Dating apps
Requires Real SIM
Exact Error Message:
Virtual numbers are not supported.
Match.com
Dating apps
Requires Real SIM
Exact Error Message:
SMS verification failed.
Badoo
Dating apps
Often Flagged
Exact Error Message:
We couldn't verify your number.
eHarmony
Dating apps
Requires Real SIM
Exact Error Message:
Please provide a standard mobile number.
Grindr
Dating apps
Requires Real SIM
Exact Error Message:
Unsupported phone carrier.
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 avoid getting blocked by 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 don't get blocked by VoIP blocklists?
You cannot "don't get blocked by" 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.