Abstract: In a wireless communication device (106) a method of detecting a narrowband jamming signal (404) includes receiving a wireless communication signal (104) and downconverting the wireless communication signal (104) to an intermediate frequency (IF) signal (525). IF signal (525) is digitized to provide a digital signal (527). Digital signal (527) is despread, demodulated and monitored for the number of phase transitions (562) occurring during a time interval (556). The method further includes comparing the number of phase transitions (562) during the time interval (556) with a threshold value (560) and determining that the wireless communication signal (104) is not the narrowband jamming signal (404) if the number of phase transitions (562) during the time interval (556) exceeds the threshold value (560), or determining that the wireless communication signal (104) is the narrowband jamming signal (404) if the number of phase transitions (562) during the time interval (556) is less than the threshold value (560).