Phantom vibration syndrome or phantom ringing is the perception that one's mobile phone is vibrating or ringing when it is not ringing. Other terms for this concept include ringxiety (a portmanteau of "ring" and "anxiety"), fauxcellarm (a portmanteau of "" /fō/ meaning "" or "" and "cellphone" and "alarm" pronounced similarly to "false alarm") and phonetom (a portmanteau of "phone" and "phantom") According to Dr. Michael Rothberg, the term is not a syndrome, but is better characterised as a tactile hallucination since the brain perceives a sensation that is not present..

Phantom ringing may be experienced while taking a shower, watching television, or using a noisy device. Humans are particularly sensitive to auditory tones between 1,000 and 6,000 hertz, and basic mobile phone ringers often fall within this range. Phantom vibrations develop after carrying a cell phone set to use vibrating alerts. Researcher Michelle Drouin found that almost 9 of 10 undergraduates at her college experienced phantom vibrations.

In most studies, a majority of cell phone users report experiencing occasional phantom vibrations or ringing, with reported rates ranging from 27.4% to 89%. Once every two weeks is a typical frequency for the sensations, though a minority experience them daily. Most people are not seriously bothered by the sensations.