  Using the fact that the neutrino mixing matrix $U = U^\dagger_{e}U_{\nu}$,
where $U_{e}$ and $U_{\nu}$ result from the diagonalisation of the charged
lepton and neutrino mass matrices, we analyse the predictions based on the sum
rules which the Dirac phase $\delta$ present in $U$ satisfies when $U_{\nu}$
has a form dictated by, or associated with, discrete flavour symmetries and
$U_e$ has a "minimal" form (in terms of angles and phases it contains) that can
provide the requisite corrections to $U_{\nu}$, so that the reactor,
atmospheric and solar neutrino mixing angles $\theta_{13}$, $\theta_{23}$ and
$\theta_{12}$ have values compatible with the current data.
