You won’t get simple answers to complex questions. 
Remember that mass surveillance by government is only one aspect of privacy fail.
Specifically regarding mass surveillance by government, yes, TOR is good, or at least VPN (preferably foreign server endpoint).
Don’t use the phone network at all, particularly the mobile phone network. This is an extreme position for sure - only you can decide what your threat model is, what your tolerance for privacy fail is, what non-monetary cost you are willing to bear. Regardless, the Librem 5 can certainly help with managing the problems with the mobile phone network.
Always use end-to-end encryption. Implies choosing your communication (messaging) services carefully.
Always use software that can be verified from bottom to top. Implies always use open source software. All Purism products can help with that.