Guides
Phone validation vs phone verification: what's the difference?
Phone validation checks the number; verification proves the user holds it. What each one stops, what they cost, and how to combine them in one flow.
7 min read
Articles tagged “Sign up fraud”
11 articles.
Fraud prevention
How to check if a phone number has a Netflix, Amazon or Microsoft account (and what it tells a fraud team)
You can check whether a Netflix, Amazon or Microsoft account uses a phone number (yes, no or unknown), but never see the account itself. How fraud teams use it.
10 min read
Guides
How to check if a phone number has an X (Twitter) account
To check if a number is linked to an X (Twitter) account, send it to a registration check: you get registered, not registered or unknown, never the handle.
11 min read
Fraud prevention
Promo abuse: how to stop multi-accounting without punishing real customers
How promo abuse and multi-accounting work, which phone signals help, and friction tiers that stop repeat claims without punishing real customers.
7 min read
Guides
How to check if a phone number has a Facebook or Instagram account
Check if a phone number has a Facebook or Instagram account: a yes, no or unknown answer with a date, never a profile. Real time or bulk, with WhatsApp.
10 min read
Fraud prevention
How to tell if a phone number is fake: a practical checklist
How to tell if a phone number is fake at sign-up, in a lead form or on a list: format, line type, network status, app presence, reputation and patterns.
11 min read
Guides
How to check if a phone number has an Apple ID (single and bulk)
How to check if a phone number has an Apple ID (Apple Account), one or in bulk: what yes, no and unknown mean, how it differs from iMessage, API examples.
7 min read
Guides
Non-fixed VoIP numbers: what they are, what they're used for and how to spot one
A non-fixed VoIP number works from anywhere over the internet. What it's used for, how it differs from fixed VoIP, and how to tell if a number is VoIP.
7 min read
Fraud prevention
OTP fraud prevention: the checks to run before you send a code
Before sending an OTP, look up the number: number type, line type and carrier, HLR status, porting. Which APIs offer it, what to compare, a pre-send flow.
10 min read
Fraud prevention
How to reduce fake sign-ups with layered phone and e-mail checks
A layered sign-up defence: format, line type, messaging presence, spam reputation and e-mail checks, mapped to friction tiers you can measure.
8 min read
Fraud prevention
VoIP number detection for sign-ups: what works and what to watch out for
Why VoIP numbers matter at sign-up, fixed vs non-fixed VoIP, which signals detect them, and how to add friction without turning away real customers.
8 min read
