WhatsApp Messenger is a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS. WhatsApp Messenger is available for iPhone, BlackBerry, Android, Windows Phone and Nokia and yes, those phones can all message each other! Because WhatsApp Messenger uses the same internet data plan that you use for email and web browsing, there is no cost to message and stay in touch with your friends.
In addition to basic messaging WhatsApp users can create groups, send each other unlimited images, video and audio media messages.

Download WhatsApp for Pc :
Mac OS X 10.9 and higher | 0.2.9229 | 130,24 MB |
Windows 8 and higher (32-bit version) | 0.2.9229 | 125,16 MB |
Windows 8 and higher (64-bit version) | 0.2.9229 | 133,31 MB |

Download WhatsApp  for Phone
Download for iPhone | 2.18.31 | 155 MB |
Download for Android | 2.18.78 | APK  | 35,18 MB |
Download for Android | Play Store |
Download for Android | for register beta tester |
Download for BlackBerry | open from Blackberry phone |
Download for Nokia Symbian | open from Nokia Symbian 2.16.57 | SIS |
Download for Nokia S40 | open from Nokia phone |
Download for Windows Phone | 2.17.346 |

Jika tidak ingin repot-repot mendownload bisa juga langsung melalui web : WhatsApp Web

Cara pemakian Whtas App PC /Web : 
→ Buka Aplikasi yang sudah diinstal / Web dengan Mozilla,Chomre,Opera, dll

→ Buka Aplikasi WhatsApp dari Smartphone, lalu ambil menu, pilih  WhatsApp Web

→ Scan Barcode yang ada di PC dengan Smartphone, dan otomatis akan Login