How to Run Phone Number Activity Checks: From New Delivery Threshold Rules to Cross-Platform Activity Tiering Screening

Why does a list that has already been screened for registrations still have low open rates and even drag down sender quality ratings? This article explains the essential difference between "number registered" and "number active" in light of recent dynamic delivery threshold mechanisms on messaging platforms, and breaks down the activity detection dimensions and tiered execution workflow for WhatsApp, Telegram, LINE, Zalo, and Viber.