Hush-A-Phone V. United States

Hush-A-Phone v. United States, 238 F.2d 266 (D.C. Cir. 1956) was a seminal ruling in United States telecommunications law decided by the D.C. Circuit Court of Appeals. Hush-A-Phone Corporation marketed a small, cup-like device which mounted on the speaking party's phone, reducing the risk of conversations being overheard and increasing sound fidelity for the listening party. AT&T, citing the Communications Act of 1934, which stated in part that the company had the right to make charges and dictate "the classifications, practices, and regulations affecting such charges," claimed the right to "forbid attachment to the telephone of any device 'not furnished by the telephone company.'" During this era, the phones were leased from the phone company, not owned by the consumer.

Initially, the Federal Communications Commission (FCC) found in AT&T's favor; it found that the device was a "foreign attachment" subject to AT&T control and that unrestricted use of the device could, in the commission's opinion, result in a general deterioration of the quality of telephone service.