Strategy
Checker waterfall: phonecheck → active → messenger → SMS
Combine task types for lowest cost per delivered message. Phone intelligence pipeline on Cheker.pro.
2026-08-03 · 4 min
- #waterfall
- #phonecheck
- #active_check
- #sms routing
- #bulk strategy
Waterfall runs checkers from cheap to expensive so you do not spend budget on dead or wrong-channel contacts.
Layer 1: phonecheck
Phone Number Validation — format, line type, reachability. Filters garbage before ws/tg.
Layer 2: active_check
Number Active Checker — SIM activity. Saves SMS traffic cost.
Layer 3: messengers
WhatsApp → Telegram → Viber. One channel per task.
Layer 4: carrier + SMS
Remainder via carrier for SMPP route selection.
Economics
Cascade cuts cost per delivered contact 30–50% vs running ws/tg on the full list upfront.
Live check
Run bulk checks in the Cheker platform.
Open platform