  Two cosmological models with non-phantom matter having the same expansion of
the universe as phantom cosmologies are constructed. The first model is
characterized by the evolving gravitational "constant" $G$ and a dark energy
component with a non-conserved energy-momentum tensor. The second model
includes two interacting components, the dark energy component and the matter
component. Closed form solutions are obtained for the constant values of model
parameters and constraints on the parameters of each model from cosmological
observations are outlined. For both models it is explicitly shown how the
components of each model produce the expansion of the universe characteristic
of phantom cosmologies, despite the absence of phantom energy. These findings
stress the interpretation of phantom energy as an effective description of the
more complex dynamics of non-phantom matter.
