WhatsApp is really a best communication apps it is fast to write text and share video and audio and documents. This also best for broadcasting the message. The group communication is best for communicate with their friends. It work on low internet connection very good. It reliable for messaging. It has good quality in video calling clear video quality at video calling and also send audio quality and you can send audio cut if any one not receiving your phone. This time I thing crores of people using this apps because of reliable.