I just learned my Google Voice call history is available to their customer service employees

I just learned my Google Voice call history (who I call, when, etc) is available to their tech support employees. And then someone told me it's the same thing with all the major phone carriers. Since getting everyone to switch to an encrypted phone service like Signal isn't realistic, is there any carrier/service I can use to keep my call history private?

I would like to see this info in the terms and conditions but I don't think I've ever …

call carriers customer customer service employees encrypted encrypted phone etc google history major phone privacy service support switch tech tech support voice