4 articles.
Deliverability
Why a number is not SMS-capable (landline, toll-free, VoIP, invalid, opted out), what the API error codes mean, and how to check a number before you send.
14 min read
Fraud prevention
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
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
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
