A typical trashy exploitation of the early 80s, Don’t Answer the Phone! does provide interesting setup of a serial killer calling to a radio psychologist and tormenting her with descriptions of his evil doings, but in the end does very little else in a satisfactory way.
Instead for opting for well build suspension, the movie focuses on providing lots of on-screen sadism that does very little in providing scares, but just concentrates on giving the blood hounds out there the gore and the agony that they came in for.
If trashy gonzo slashers are your thing, Don’t Answer the Phone! more than delivers – but if it is actual horror you’re after, you will want to look elsewhere.