https://veri-flow.app/en/blog Articles about number validation, API and WhatsApp marketing. en https://veri-flow.app/en/blog/whatsapp-phone-number-format https://veri-flow.app/en/blog/whatsapp-phone-number-format Thu, 22 Oct 2026 12:00:07 GMT Validação The WhatsApp phone number format is E.164. How it works, with examples from the US, UK, India, Mexico and Brazil, and the rules to fix a whole list. https://veri-flow.app/en/blog/contact-list-cleaning https://veri-flow.app/en/blog/contact-list-cleaning Tue, 20 Oct 2026 12:00:26 GMT Validação A 10-step contact list cleaning checklist for WhatsApp and SMS campaigns, with before-and-after examples from several countries. https://veri-flow.app/en/blog/how-to-check-if-a-number-is-on-whatsapp https://veri-flow.app/en/blog/how-to-check-if-a-number-is-on-whatsapp Thu, 15 Oct 2026 12:00:05 GMT Validação Five ways to check if a number is on WhatsApp, from a single contact to a list of millions, and which methods put your own account at risk. https://veri-flow.app/en/blog/validate-whatsapp-numbers https://veri-flow.app/en/blog/validate-whatsapp-numbers Tue, 13 Oct 2026 12:00:00 GMT Validação What it means to validate WhatsApp numbers, what the check solves, what it can't, and a step-by-step process to clean a list of any size.