Brief mobile-device-policy owners on SMS-blaster smishing in CH

Add SMS-blaster awareness to federal-employee mobile-security guidance: if a handset briefly drops to 2G and immediately receives an SMS purporting to be from authorities, banks or courier services, treat the SMS as hostile regardless of carrier-side filtering. Where MDM supports it (Android 12+ Enterprise restrictions), disable 2G fallback on managed devices that do not need it. Add the smishing-lure language patterns the ebas.ch article describes to the IR runbook for staff-reported smishing. Coordinate with the federal mobile operator account team to obtain any SMS-blaster sightings the carrier has correlated against handset RAT (radio access technology) downgrade telemetry.