Can I read the whatsapp conversation between two different mobile phones?

Can I read the whatsapp conversation between two different mobile phones?
I have a friend who has ever used a program to spy on whatsapp conversations. This program doesn't have to be connected to the same internet connection. Does anybody know what this program is called, and how it works?

---

› See More: Can I read the whatsapp conversation between two different mobile phones?

iKeyMonitor Mobile Spy Key logger - Run in stealth, invisibly SPY.

• Spy on websites visited
• Spy on SMS, WhatsApp Msg
• Spy on Keystrokes, Passwords
• Send the logs to you by Email/FTP
• Spy on Facebook Msg, Skype, IM+, Kik, Viber... and more...

For iPhone, iPad, iPod Touch: Download in "Cydia" for Free - 100% FULL Functional !

For Android, BlackBerry, Windows Phone, Symbian: Get Mobile Spy - Cell Phone Spy !

Well I think it is not possible with official WhatsApp but you can that kind of tool which help you to do so what you want to but you can also use this WhatsApp Plus which is a modified version of WhatsApp it has some features and functions which allow you to use dual WhatsApp with two different numbers and you can also read all WhatsApp conversation between two mobile phones if you use this WhatsApp plus.

This What I am looking for thanks for sharing it here..