Whatweb

WHY USE WHAT: WhatsApp uses your phone's Wi-Fi line (4G/3G/2G/EDGE or Wi-Fi, depending on availability) to text you and call your friend and relatives so you don't have to spend every minute you get a call or every day you call. Sending and receiving pictures, video, documents and voice messages.

• Free calls: Call your boyfriends and girlfriends for free with WhatsApp Calling, even if they're in a different location * WhatsApp uses your phone's Wi-Fi line, not the call time of your mobile schedule (note: there may be information charges). In addition, you cannot use WhatsApp to call 911 and other 911s.
• Group Chat: Enjoy group chat with your contact list so you can keep in contact with your friend or your loved one. - WHATSAPP WEB: WhatsApp news can also be sent and received directly from your computer's web browsers. It works with your telephone number, just like text messaging, and fits neatly into your phone's current directory.
• ALWAYS LOGIN: WhatsApp keeps you always signed in so you don't miss any news. There' s no more messing about whether you're booked in or out. - FAST CONNECTION WITH YOUR CONTACTS: You can use your contact list to quickly and simply link you to your WhatsApp contact list, so you don't have to enter difficult to memorize user names.
• OFFLINE MESSAGES: WhatsApp saves your latest news until the next times you use the application, even if you miss your alerts or turn off your mobile device. Split your locations, swap people, customize background images and messaging noises, send instant messaging to more than one contact, and more!