What types of modern phone tapping exist today?

What are the different ways / technologies used today (2020) to tap phones today?
Are the technologies out there so terrible that the people being tapped know about it or is that a product of using old tech and not minding if people know that they’re being surveilled?

Specifically, I was listening to the link below and was amazed that the (alleged) victim of phone tapping in Uganda was saying about his phone being tapped in 2020,

"If I’m making a phone call that is supposed to be a confidential
phone call, if I begin to talk about names of people.. my phone begins
to click immediately and sometimes you’d hear people speaking in the
background."

https://youtu.be/bL0OmORIAls?t=424