Come on! Did you really think that when you bought (or rented) a high-tech device that is connected to a "free" worldwide digital network that crosses international borders and connects with satellites and other government controlled systems that your activity would be PRIVATE.
The important part of the conversation IMHO (in my humble opinion) is your purposes for using it in the first place. If we took a poll today we would probably discover that 80-90% (my subjective guess here) of smartphone and tablet device use is of limited importance in the grand scheme of things.
Yes, there are legally "privileged" conversations and communications between a few people but most of them are innocuous. And then there are a few "grey" areas that should or could be protected in the interests of national security.
What probably remains is communications activity and commerce that is illegal, immoral, offensive, or just plain unacceptable (by all standards) to those above who bought or rented their devices in the first place. And most of us would prefer to have someone (not us) around to eliminate it.
So what's the big deal, beyond the First Amendment, of course?
NSA controls your iPhone
Thanks to Security Affairs