I'm confused, you seem to have not read the entirety of the very sentence you quote. Here, I'll highlight it: "Zfone, however, uses stronger encryption".
Thus, while PGP might have slowed them down, Zfone's encryption makes it 'impossible.'
Further, this has nothing to do with a warrant, clearly you don't understand encryption if you think a warrant will help.
Public key PGP encryption can be broken?
The only thing I could figure out was he meant a warrant to plant a bug (listening device).
"I'm confused, you seem to have not read the entirety of the very sentence you quote. Here, I'll highlight it: "Zfone, however, uses stronger encryption". "
No i read that part...it's stronger than something that causes delays. I'm still missing the part that makes decryption impossible. Perhaps you have other information you aren't sharing?
"Further, this has nothing to do with a warrant, clearly you don't understand encryption if you think a warrant will help."
And you apparently understand warrants. Wiretaps will still be more than possible. ZFone makes it harder (not impossible, or at least until you show me the article you are referencing) for someone without the proper authorization to access the communications
Also, warrants have been obtained by the FBI to install keystroke loggers and memory scanners, etc.