  We investigate the prediction on the lepton phases in theories with a non
trivial correlation between quark (CKM) and lepton (PMNS) mixing matrices. We
show that the actual evidence, under the only assumption that the correlation
matrix $V^M$ product of $CKM$ and $PMNS$ has a zero in the entry $(1,3)$, gives
us a prediction for the three CP-violating invariants $J$, $S_1$, and $S_2$. A
better determination of the lepton mixing angles will give a strong prediction
of the CP-violating invariants in the lepton sector. These will be tested in
the next generation experiments. To clarify how our prediction works, we show
how a model based on a Grand Unified Theory and the permutation flavor symmetry
$S_3$ predicts $V^M_{13}=0$.
