Integration notes, API patterns and examples for engineers.
Developers
Fictional phone number ranges that regulators reserve in the UK, US, Canada, Australia, Germany and France, how libphonenumber treats them, and safe OTP tests.
11 min read
Developers
What syntax, MX, disposable-domain and mailbox checks can tell you without sending mail, why SMTP probing gives false answers, and tested code in Node, Python and PHP.
11 min read
Developers
How AI coding agents read API docs: llms.txt, Markdown twins, OpenAPI and MCP. Set up Claude Code or Cursor, with an AGENTS.md snippet you can copy.
8 min read
Developers
Code to validate Indian mobile numbers: what ^[6-9]\d{9}$ misses, normalising +91, 0 and 0091, and tested JavaScript, Python, PHP and C# functions.
8 min read
Developers
Verify Standard Webhooks HMAC signatures in Node.js and Python: raw bodies in Express, Next.js and FastAPI, timestamps, replays, and why checks fail.
7 min read
Developers
No. libphonenumber checks numbering-plan metadata, not the network. What isValidNumber proves, what it can't, and how to check if a number is live.
7 min read
Developers
The phone validation ladder: syntax, numbering plan, line type and live checks, with the right library for JavaScript, Python, PHP, Go and Java.
7 min read
Developers
Validate phone numbers in Java and Kotlin with libphonenumber: Maven setup, E.164, a Spring Bean Validation constraint, Android notes and a live lookup.
7 min read
Developers
Validate phone numbers in Go with nyaruka/phonenumbers, format E.164, and call a lookup API with context timeouts, rate limiting and 429 back-off.
7 min read
Developers
Each phone signal goes stale at its own speed. How often to re-verify numbers, how to cache HLR, MNP and messaging-app answers, and how long to keep them.
8 min read
Developers
How to use the Idempotency-Key header to retry POST requests without double-processing: MobileValidate's rules, tested-pattern retry code for Node.js and Python, and which errors are safe to retry.
6 min read
Developers
How to design a phone number field that captures correct, consented numbers: one field, a smart country default, tel autofill, helpful errors and E.164.
8 min read
Developers
How AI agents check phone numbers and e-mail addresses safely: MCP server or function calling, which files an agent should read first, spend caps, and guardrails.
9 min read
Developers
To validate a phone number in Python, parse it with phonenumbers, check is_valid_number and store E.164. Exact NumberParseException errors, Pydantic and pytest.
9 min read
Developers
How a WhatsApp registration check works, what registered, not registered and unknown mean, and how to call it responsibly from cURL, Node and Python.
9 min read
Developers
How to normalize phone numbers to E.164 in JavaScript and Python, the pitfalls that break deduplication, and how the MobileValidate API normalizes input.
9 min read
Developers
The common E.164 regex accepts impossible numbers. Real counterexamples, the shortest valid international numbers, and what to use a regex for instead.
7 min read
Developers
How to give an AI agent phone and e-mail checks through the MobileValidate MCP server: tools, example prompts, real tool calls and spend safeguards.
9 min read
Developers
Validate phone numbers in JavaScript with libphonenumber-js: min vs max metadata, E.164, form input, and a live line-type check with runnable Node code.
9 min read
Developers
Validate phone numbers in PHP with libphonenumber-for-php, write a Laravel rule, and add a live line-type check with Guzzle that never breaks the form.
7 min read
Create a free account: approved automatically, usually within 10–15 minutes.
Free to start: check 20 phone numbers and 10 e-mail addresses for real on your account, plus an unlimited test mode. You pay only for conclusive answers, from $20.
