yeah i've already gone through all channels several times, it set on channel 5 be default, so i gradually moved it up to #10 and then backwards towards #1 it seems to be working best on channel 1. and yes a cordless phone can intefere with the signal and the wireless signal will mess up the phone as well if they are both operating on a relatively same frequency. i've been trying for ages to change the channel on the cordless phone, but it wont let me.