Step-by-step explanations of phone and e-mail checks and how to use their answers.
Guides
What carrier and line type data is, allocated vs current network, how porting changes it, and how to read every field of a carrier lookup answer.
8 min read
Guides
What iMessage registration means, blue vs green bubbles, iMessage vs RCS on iPhone, what businesses can and can't send, and a bulk API example.
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.
7 min read
Guides
Validation checks the digits, MNP finds the current network, HLR asks the network if the number is live. What each answers, costs and misses.
7 min read
Guides
Valid, active, reachable and registered mean different things. The methods for checking each one, what they cost and where every method falls short.
7 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
What a registration check tells you for WhatsApp, Telegram, Viber, Signal, iMessage, RCS, LINE, Zalo and more: modes, unknowns, billing and consent.
8 min read
Guides
A number's prefix shows the network its range was given to, not the one serving it today. How porting works, where lookups fail and how to handle it.
7 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.
8 min read
Guides
What the FCC Reassigned Numbers Database does, how its yes/no/no-data answers and TCPA safe harbor work, what it costs, and where other checks fit.
8 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
What the WhatsApp Business flag means, how it differs from a personal account, its limits, and how B2B and support teams can use it responsibly.
7 min read
Tell us about your use case. We review every request and set you up with test and live keys.
