Changes

== Abstract ==The explosion of demand for mobile data services in recent years has meant that many service providers are looking for novel pricing strategies that will allow them to recover the investment required to meet that demand.  This development has generated a number of research challenges including:

== Abstract ==

The explosion of demand for mobile data services in recent years has meant that many service providers are looking for novel pricing strategies that will allow them to recover the investment required to meet that demand.  This development has generated a number of research challenges including:

·        Which pricing mechanisms will lead to more efficient use of networks?

·        Which pricing mechanisms will lead to more efficient use of networks?