How to spy on someone’s WhatsApp messages?

To spy on someone’s WhatsApp messages is possible only by using spyware. Any other service cannot provide such opportunity. Spyware works in the following way:

  1. It has to be compatible with a target device;
  2. A device must be prepared for the app’s installation (its official source explains on the subject);
  3. It has to be installed on the target device (the process is always described on official sources);
  4. It is subscription and package-based.

Examine the following spy apps to spy on someone’s WhatsApp messages: Spyera, iKeymonitor, SpyHuman, mSpy.