Sometimes you don't want that your contacts see your last connections. Maybe you are busy, maybe you don't want answer in that moment. There are a lot of posibiities. From whatsbook, explain a simple trick that you can use and freeze the hour of your last connection. You must follow this steps.
1 - When you receive a message , before read it, put your mobile or cell in AIRPLANE MODE , this means no data connection (among other things) .
2 - Once activated airplane mode , you can enter to whatsapp and read all messages.
3 - Exit whatsapp
4 - You activate the normal mode of the mobile or cell
With these steps, you freeze your connection hour, but will can read your message