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I dont think tha will do anything to alleviate the duk dukka-duk noise. Its more likely to be the RF from your mobile interfering with the amplifier section of the sub. Perhaps a better shielded phono lead would help.
Almost all speakers and subwofoers are affected by the signals emitted by mobile phones. My REL Stentor and Logitech computer speakers do this too, but only if the phone is right next to the sub. I don't really think there is anything you can do about it other than switch off your mobile.
It has been happening for 4-5 years and it has annoyed me for 4-5 years.
Ive been slowly upgrading my whole home cinema replacing bits when I can. Im happy with the sound from the sub so if I couldve stopped the duk dukka-duk sound with a £30 cable I would have done that. If theirs nothing I can do to stop the duk dukka-duk Ill get a new sub.