Follow The steps-:
• In your PC , open the notepad text editor.
• In the notepad text editor, either type ALT+255 or type ALT+0160.
• Now after typing ALT+255/ ALT+0160 on your keyboard, there will be a blank space added to your notepad.
• Save the blank space on your computer, or press CTRL+C from your Keyboard.
You need to transfer above saved file to your android phone from your computer.
• You can transfer that file by using a data cable or any other method like Bluetooth.
After transferring the BlankSpace.txt file to your android phone, open it by using any text viewer.
• Once you open the file in text viewer, tap and hold on the blank space to copy the blank space.
• Now open your WhatsApp and select any contact whom you want to prank by sending a blank message.
• Now simply paste the copied content which you copied from that blankspace.txt file.
• Now click on send and send the message.
DONE !