What's the difference between one hook and two hooks after Whatsapp iphone sends a message?

Hook means that information reaches the server; Two hooks indicate that the information reaches the other party's mobile phone.

First, introduction.

1, WhatsApp Messenger is an application that can be used by users of iPhone, Android, Windows Phone, WhatsApp Messenger, Symbian and Blackberry in BlackBerry, and is used for communication between smart phones. With the help of push notification service, this application can immediately receive messages sent by friends, relatives and colleagues. You can switch from sending SMS to using WhatsApp to send and receive information, pictures, audio files and video information for free. Saudi local media reported in June 2065438+2003 that if WhatsApp failed to comply with the requirements of Saudi telecom regulatory authorities, Saudi Arabia would ban this internet-based communication service within a few weeks.

2.WhatsApp is a very popular cross-platform application for communication between smartphones. With the help of push notification service, this application can immediately receive messages sent by friends, relatives and colleagues. You can switch from sending SMS to using WhatsApp to send and receive information, pictures, audio files and video information for free.

3.WhatsApp is registered based on mobile phone number. When registering, you need to enter your mobile phone number and accept a verification message. Then WhatsApp will search your mobile phone contacts for people who are already in use, and automatically add them to your mobile phone contact list.

Second, the application function.

1, no hidden charges. Once you and your friends download this application, you can enjoy chatting with it. You can send/kloc-0,000,000 messages to your friends for free every day! WhatsApp uses your Internet connection: Use 3G/EDGE or wireless network when available.

2. Multimedia SMS service. Send videos, pictures and voice files to your friends. (To send and save video files, you need to use an iPhone. )

3. There are no international expenses. Just as there is no extra charge for sending international emails, there is no charge for sending international WhatsApp messages. As long as your friends also install WhatsApp Messenger, you can chat with friends all over the world and avoid the troubles caused by international SMS charges.

4. Mobile phone number association. Why bother remembering groups of passwords or usernames? Just like SMS, WhatsApp can be combined with your mobile phone number and perfectly integrated with the information in your existing mobile phone address book.