I've always liked this movie. But watching it now it is difficult not to laugh out loud at the ridiculous scenes featuring Tyne Daley and her "supercomputer." This stuff was out of date when the film came out, relying on "Lost in Space" style simplicity.
But that's forgivable. What really kept the flick from really being a classic, however, is that it is totally missing the third act! The film ends abruptly with the villain, Dalchimsky, done away with in a fairly simple manner in the small town bar. In the novel, Dalchimsky is also killed in the bar, but not before passing along the coded message that set off the last "sleeper" who then proceeds to make his way to blow up Hoover Dam (or some big damcan't remember off the top of my head). Then Bronson and Remick's characters had to race to stop the impending disaster. It was a big, exciting ending and I can't understand why they left it out. Maybe they just didn't have the budget. I think spending the dough it would have taken to include the book's ending would have helped mitigate the low budget "TV Movie" feeling "Telefon" often suffers from. But producers knew that Bronson's name would consistently pull a certain audience no matter what, so they rarely tried to do anything big in his films and he never insisted on ita fact that eventually led to the decline of his career.