13 articles.
Fraud prevention
For number providers, MVNOs and virtual-number resellers: quarantine rules by country, the FCC database, and HLR and app-account checks before reissue.
12 min read
Fraud prevention
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
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
Guides
Is a WhatsApp number check legal? GDPR, India's DPDP Act, Brazil's LGPD, Malaysia's PDPA and US rules, and why registration is not permission to message.
10 min read
Guides
WhatsApp usernames hide phone numbers from new contacts, but accounts still sit on a number. What changes for businesses, the Cloud API and number checks.
7 min read
Guides
A Signal number lookup can only say whether a findable Signal account uses a number you hold, never whose it is. What the check sees and when not to use it.
7 min read
Guides
What the IMSI, MSISDN, ICCID and IMEI are, where each lives, what changes when you port or swap a SIM, and why the IMSI must never leave the network.
8 min read
Guides
E-mail verification explained step by step: syntax, MX, mailbox, catch-all, disposable and bounce checks, account signals, privacy rules, and which check fits which job.
10 min read
Guides
How Telegram's phone and username model differs, what a registration check can and can't tell you, how privacy settings affect it, with API examples.
7 min read
Guides
Mailbox validation says an address can receive mail. An account check says it is registered on a service. When to use each, and the privacy rules.
8 min read
Guides
When a phone number is personal data under the GDPR, what changes for business numbers, and how lookups and enrichment fit lawful basis, notice and rights.
10 min read
Guides
The criteria that matter when you choose a phone-intelligence API: coverage, conclusive rates, unknown billing, latency, freshness, privacy and test mode.
9 min read
Guides
A practical GDPR-oriented checklist for phone and e-mail checks: purpose, lawful basis, minimisation, retention, objections, rights, DPAs and logging.
9 min read
