Have you tried this new Android app, WhatsMonitor ? You can track any number on WhatsApp, no need to install anything on the target device. It has a 3 day trial, real time per number notifications, auto-refresh. Just search "whatsmonitor" in Google Play Store. It's been working just fine, no downtimeshttps://play.google.com/store/apps/details?id=ro.whatsmonitortor