3 articles.
Guides
Eight phone validation and lookup APIs compared on public, dated evidence: data fields, price at 10,000 lookups, billing of failed lookups, SDKs and MCP, plus a bake-off script.
12 min read
Fraud prevention
Attackers change an account's phone number before resetting everything else. A checklist to secure the change-number flow without locking out real users.
7 min read
Fraud prevention
What a SIM swap is, which SIM-swap data exists and who can get it, and which signals to combine before you trust an SMS code when that data is missing.
9 min read
