Nobody wants to admit that surveillance is two sided for years now I have always been a critic of mass government surveillance. However there is another side to debate that is rarely discussed private surveillance where citizens will buy inexpensive hardware slap it all together to create a monstrous device that can tap phone calls, text messages and a wider assortment of other metadata. All from the comfort of there own homes or sometimes there own cars even depending on how motivated they are and this stuff does happened.
Here's a few examples of different types of private surveillance devices an ordinary citizen might have built or own
Some Assembly Required:
https://www.evilsocket.net/2016/03/31/how-to-build-your-own-rogue-gsm-bts-for-fun-and-profit
Prepackaged: