There are many mobile phones available on the market that act as transmitters A mobile can be placed in your home and you can call that mobile in order to hear what is being said. Downside is that after a few weeks the battery will be drained and it would then be needed to gain access to retrieve the mobile and re-charge it There are also versions that act as trackers. There are not batteries that act as a transmitter but there are many miniature transmitters that can be placed in a mobile phone, they can be bugged very easily There are also receivers and scanners that allow to hear mobile phone conversations with no need for a special transmitter in the phone, all mobile phones transmit in certain frequencies and are themselves transmitters, so, essentially, you just need a receiver Be aware that telephone tapping and telephone interception is illegal.
Calls from payfones/mobiles might be higher.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.