The vocabulary of the Disposable Phone Checker API

A temporary phone number that can be used briefly and then discarded, typically obtained through VOIP apps or online services.

Disposable phone numbers are designed for temporary use. They allow users to receive SMS messages without revealing their real phone number. While useful for privacy, they're frequently abused for fraud because they can be obtained anonymously and in bulk.

ExampleA user signs up for TextNow, gets a free number, uses it to verify a new account, then abandons the number.

A phone number that operates over the internet (Voice over IP) rather than traditional telephone networks.

VOIP numbers are assigned by internet-based phone services like Google Voice, Skype, Vonage, and business phone systems. They can make and receive calls/texts over internet connections. Some VOIP services require minimal verification, making them popular for disposable use.

ExampleGoogle Voice provides free VOIP numbers to Gmail users, which can receive SMS verification codes.

A prepaid mobile phone or phone number intended for temporary, anonymous use.

The term comes from prepaid phones that can be "burned" (discarded) after use. Today it also refers to apps like Burner and Hushed that provide temporary numbers. Burner phones/numbers are used for privacy but also commonly for fraud.

ExampleThe Burner app lets users create temporary phone numbers that auto-expire after a set period.

A phone number not directly associated with a physical phone line or SIM card.

Virtual numbers are routed over the internet and can forward to any device. They're used legitimately by businesses for local presence in multiple areas, but also exploited as disposable numbers. The term is often used interchangeably with VOIP numbers.

ExampleA business uses virtual numbers with local area codes in 50 cities, all forwarding to their central call center.

An authentication method that sends a one-time code via SMS to verify the user controls a phone number.

SMS verification is widely used for account signup, password reset, and two-factor authentication. It assumes phone numbers are tied to real identities. Disposable phone services undermine this assumption, allowing verification with anonymous numbers.

ExampleDuring signup, the app sends a 6-digit code to the user's phone number. The user enters the code to prove they control that number.

A single-use code sent via SMS or generated by an app for authentication purposes.

OTPs are the codes sent during SMS verification. They're typically 4-6 digits and expire after a short time. The security of OTP verification depends on the phone number being tied to a real, verified user—which disposable numbers undermine.

ExampleYour verification code is 847293. This code expires in 10 minutes.

A numerical value indicating the likelihood that a phone number or action is associated with fraud.

Risk scores aggregate multiple signals: number type (disposable/VOIP/mobile), carrier reputation, geographic consistency, velocity patterns, and more. Scores typically range 0-100, with higher scores indicating higher risk. Thresholds determine whether to block, flag for review, or allow.

ExampleA phone number from a known disposable service might receive a risk score of 85/100, triggering additional verification requirements.

A telecommunications company that provides cellular phone service (AT&T, Verizon, T-Mobile, etc.).

Mobile carriers issue phone numbers tied to SIM cards and require some level of identity verification. Numbers from major carriers are generally lower risk than VOIP numbers, though prepaid SIMs reduce this advantage.

ExampleA number from Verizon Wireless is a mobile carrier number, while a Google Voice number is VOIP.

A real-time query to the Home Location Register to get current information about a phone number.

HLR (Home Location Register) lookups query mobile network databases to determine a number's current carrier, whether it's active, and roaming status. They provide accurate, real-time carrier information but add cost and latency to verification flows.

ExampleAn HLR lookup reveals that a number originally issued by AT&T was ported to Google Voice.

A SIM card purchased without a contract, often with minimal identity verification requirements.

Prepaid SIMs can be purchased at retail stores with cash and minimal ID in many countries. This makes them somewhat anonymous, bridging the gap between verified mobile numbers and completely anonymous VOIP numbers. Fraudsters sometimes use prepaid SIMs for slightly more legitimacy.

ExampleBuying a prepaid SIM at a convenience store provides a mobile number without the verification required for postpaid accounts.