According to sources WhatsApp is one of the most commonly used messenger service across the world. This server has very little security and hence can be hacked very easily. Meanwhile there are two ways to hack a WhatsApp device one is through IMEI number and the other through Wi-Fi.
Generally, Android and Apple devices that use WhatsApp do not have any security. It is Blackberry devices that are extremely safe as they use their own server, while others use the WhatsApp server. So, generally, avoid using Wi-Fi for WhatsApp, if and whenever it is possible.
Never share your IMEI number and avoid keeping your phone out at places
where it can be accessible to others. Once the user has your IMEI number, he or
she can easily hack your device and read all your messages. Presently hacking
has become more common and much online scam issue is increasing rapidly
and it is all in our hands to protect ourselves from hacking.
