Security on Government's Computing and Communications

Something to ponder if your government is
concerned to protect the right and privacy of
your country men. Been doubting if there is a
government already have existing or just
currently implemented the security of their
computing and communications infrastructure. Like
the U.S. phones are encrypted, cannot be
wiretapped easily. Just easily because this might
still be cracked, who knows. Are they really
secure? Are they free from vulnerabilites and
security breaches?