MaxxSpy is a mobile phone monitoring software that allows users to secretly track cell phone activities and hack WhatsApp messages. It has features like GPS tracking, call history monitoring, message tracking for WhatsApp, Facebook, Viber, and more. The software is easy to install on a target phone and can then be accessed online through a user account to view all monitored data in real-time from any internet browser. Customers report that MaxxSpy is effective for mobile tracking and hacking messages without detection.