  We study a model with partial quark-lepton universality that can naturally
arise in grand unified theories. We find that constraints on the model can be
reduced to a single condition on the Dirac CP phase $\delta$ in the neutrino
sector. Using our current knowledge of the CKM and PMNS mixing matrices, we
predict $-32.4^\circ < \delta < 32.0^\circ$ at $2\sigma$.
