As a Telecommunication Enginneer and also researcher in Wireless COmmunication I would be able to give you complete description of each and every question. I am also having the whats app aplication installed. 2ndly I have studied Analogue communication, digital communication, wireless communication in my bechlors degree. and now have recently completed Advance Digital communication and Also Advance Wireless communication in my university. If you need any help I will provide. You can also check my research papers in field of wireless communication. If Any Question you have you can ask freely.