  We study an extension of the standard model based on the flavor symmetry A4
only. Neutrino Majorana mass terms arise from dimension five operator and
charged lepton masses from renormalizable Yukawa couplings. We introduce three
Higgs doublets that belong to one triplet irreducible representation of A4. We
study the most general A4-invariant scalar potential and the phenomenological
consequences of the model. We find that the reactor angle could be as large as
0.03, while the atmospheric mixing angle is close to maximal.
