Guides
How to check if a number is on WhatsApp without saving it as a contact
Three free ways to check if a number is on WhatsApp without adding a contact, what the wa.me 'invalid' message means, and how to format numbers by country.
11 min read
Articles tagged “Channel selection”
16 articles.
Guides
WhatsApp usernames: what changes, and what doesn't, for checking a number
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
Deliverability
Viber number check: a practical guide for businesses
How to check if a number has Viber, where Viber matters most, how checks relate to Viber Business Messages, and a cost model for Viber-first sending.
7 min read
Guides
Bulk Telegram number check for Asian customer lists (Indonesia, India, Philippines, Vietnam, Hong Kong)
Check Telegram numbers in bulk for Indonesia, India, the Philippines, Vietnam, Hong Kong and more: normalising Asian formats, privacy and unknowns, cost caps.
7 min read
Guides
Bulk WhatsApp number check: how to verify a customer list (CSV upload or API)
Check WhatsApp numbers in bulk: prepare a CSV, get a free estimate, cap the cost, run the job in the dashboard or API, and act on each answer.
8 min read
Guides
How to check if a phone number has an Apple ID (single and bulk)
How to check if a phone number has an Apple ID (Apple Account), one or in bulk: what yes, no and unknown mean, how it differs from iMessage, API examples.
7 min read
Deliverability
WhatsApp Business API pricing in 2026: per-message rates, the October changes and India's rupee deadline
WhatsApp Business API pricing 2026: Meta charges per delivered template by category and country (OTP $0.0008 to $0.0550). October changes, INR deadline.
11 min read
Deliverability
What is RCS? Rich Communication Services explained for businesses
RCS (Rich Communication Services) upgrades SMS in the default messaging app. What the spec covers, RCS vs SMS and chat apps, and how to check who can get it.
7 min read
Guides
Phone numbers by country: formats, portability, channels and rules
How phone numbers differ by country: formats and E.164, numbering changes, portability, line types, messaging channels, and a dated tracker of calling and texting rules.
11 min read
Guides
How to check if a phone number uses iMessage
To check if a number uses iMessage, run a bulk iMessage check (yes, no or unknown). Find your own iMessage ID in Settings, plus blue vs green bubbles and RCS.
7 min read
Deliverability
How to choose a messaging channel by country
WhatsApp, Telegram, Viber, LINE, Zalo, RCS or SMS? How to pick a channel per country for messages customers expect, and measure it on your own base.
7 min read
Guides
Messaging-app registration checks: a guide for every app
What a registration check tells you for WhatsApp, Telegram, Viber, Signal, iMessage, RCS, LINE, Zalo and more: modes, unknowns, billing and consent.
9 min read
Deliverability
RCS capability check: what it tells senders before they send
To test if a number supports RCS, run a capability check: capable, not capable or unknown, before you send. Plus test numbers, iPhone support and SMS fallback.
9 min read
Guides
Telegram number check: a practical guide to what it can and can't tell you
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
Deliverability
WhatsApp OTP vs SMS OTP: cost per verified user, with a calculator
WhatsApp OTP pricing in 2026: Meta charges $0.0008 to $0.0550 per delivered authentication message, by country. Rates vs SMS and a cost-per-user calculator.
9 min read
Developers
How to check if a phone number is on WhatsApp with an API
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
