Today's mobile devices are getting bigger and bigger in size which looks like we are getting back 40 years ago when the first cellular phone was invented by Martin Cooper of Motorola.The size of this phone was like a shoes box,so why are cellphone manufacturers making big phones again?Is it because of MIMO technology?Maybe they need a big room to accommodate mimo antennas?I believe this not the case because many cell phones are still using diversity and or MIMO or both.I am just looking for insights on this topic!!Thanks