Virtual Phone Number Detection

We constantly monitor the web to detect and identify new virtual and temporary phone numbers.

Implementing disposable phone number detection in your application is crucial to protect you from fraudsters and spammers. Try out our detector with free lookups.

Per verification
Disposable numbers detected
120 000+
Constantly updated database

Onboard real users, not bots

Create an account and try out NumCheckr with 100 free checks per month.


Why integrating a disposable phone number detector?

We’re making it easy for everyone to fight fraudsters hiding behind virtual phone numbers.

Avoid fraudsters and spammers

Easily determine which of your users are utilizing temporary phone numbers. Once identified, it is up to you to decide how to handle these users - whether to block them or flag them for further review.

Cut down on SMS expenses

Detecting disposable phone numbers upfront will prevent you from having to send them OTPs, resulting in significant cost savings on your text message bill (Twilio, Vonage, AWS SNS, etc.).

Get additional information

In addition to determining whether the phone number is disposable or not, we provide you with some additional information that may be useful, such as the number's country, carrier or line type.

Frequently asked questions

If you have a different question and are unable to find the answer you seek, please feel free to contact our support team by sending us an email. We’ll get back to you as soon as we can.

What is a disposable phone number?

A disposable phone number is a temporary and anonymous telephone number that can be easily obtained on various websites (OnlineSIM, AnonymSMS...) and used for a short period of time. Any text message sent to this number is automatically forwarded to the affiliated website.

It is commonly utilized to avoid sharing personal numbers when signing up for websites or services. However, in practice, these numbers are mostly used for malicious purposes, such as creating fake accounts or engaging in fraudulent activities.

How to integrate NumCheckr in my application?

Our platform provides a convenient REST API that allows you to verify whether a phone number is disposable or not.

We recommend incorporating this API call into your user onboarding process. By checking the validity of the phone number and preventing users with disposable numbers from proceeding, you can effectively thwart fraudsters right from the start. This approach also helps you avoid wasting money by sending verification codes (OTP) to virtual numbers.

How do you detect disposable phone numbers?

We use a combination of real-time scraping, data analysis and machine learning to detect and identify virtual and temporary phone numbers. Our team constantly improves and updates our detection models to remain proactive in the face of ever-changing fraudulent practices.