Hi, are they on your property or on the line between the exchange/cabinet and your property. They were only ever deployed on long lines to create lumped low pass filters that assisted with long line losses, but these are lines in the >5km length, they have not been commonly used in urban areas for years, that said I have found them on the line of houses close to MF/AM transmitters (Titahi Bay or Henderson for example), I simply remove them, the DSL filter will keep the Tx's out of the voice side of the line.
Like Cyril said Loading coils were installed on cables as low pass filters to add in the transmision of voice frequencys on long lines (+5km from equipment), DSL services are retarded by them and in most cases DSL will not get though at all. With the advent of cabinets with remote DSL& Voice systems, loading coils are progressively being removed off the distribution cables when it becomes nessesary and/or appropriate to do so ( some can not be (economical removed) due to ongoing requirements of the cables performance). They were also deployed on cables that were used to interconnect exchanges and many of these cables have now been converted to being used for more local use, with the more common use of Fibre for exchange interconnect, their loading coils are also being removed where appropriate.
Im sure than 'Loading coil' removal can be investigated, for cable groaming for DSL, by Chorus if an ISP requests it
If VF were talking about noise chokes (which are again another form of inductive coils) these are generaly deployed in Exchs & Cabinets for the supression of 'noise' on particular cables but theses are deployed after the voice equipment and before the DSLAM so shouldnt effect xDSL services