  We perform a comprehensive analysis of the phenomenology of leptonic low and
high energy CP phases in a scenario with three heavy right-handed neutrinos in
which a flavor and a CP symmetry are non-trivially broken. All CP phases as
well as lepton mixing angles are determined by the properties of the flavor and
CP symmetry and one free real parameter. We focus on the generation of the
baryon asymmetry Y_B of the Universe via unflavored leptogenesis and the
predictions of m_ee, the quantity measurable in neutrinoless double beta decay.
We show that the sign of Y_B can be fixed and the allowed parameter range of
m_ee can be strongly constrained. We argue on general grounds that the CP
asymmetries epsilon_i are dominated by the contribution associated with one
Majorana phase and that in cases in which only the Dirac phase is non-trivial
the sign of Y_B depends on further parameters. In addition, we comment on the
case of flavored leptogenesis where in general the knowledge of the CP phases
and light neutrino mass spectrum is also not sufficient in order to fix the
sign of the CP asymmetries. As examples we discuss the series of flavor groups
Delta (3 n^2) and Delta (6 n^2), n >= 2 integer, and several classes of CP
transformations.
