This document advertises 1TopSpy cell phone tracking software and describes how it can be used to check Viber on another phone. It claims the software allows users to track location, read messages from apps like WhatsApp and Viber, see call logs and photos, and more from another target phone in real time and without detection. The process is described as easy - installing the software on the target phone, logging into an online account, and accessing monitored phone data through a control panel. Customer testimonials praise how the software allows worrying about children's safety and monitoring employees.