Question on DSL

[simbananacat]

I have recently gone to DSL and I do love it.   But I am having 
static and interference on the two phones in the bedrooms.  The 
phones in the kitchen and living room are fine.  Does anyone know why 
this would be and how do I fix it?  I don't know if it is effecting 
only the bedroom phones since they are closer to the den where the 
computer is,  or maybe they are just not good quality phones.  Any 
ideas?