Sony has silently announced a new smartphone, the Xperia A4, in its home country of Japan for NTT Docomo. The device has a model number SO-04G, and could be launched as the Xpera Z4 compact in future. Recall that the Xperia Z1f with model number SO-02F was later launched as the Xperia Z1 compact globally. Same goes for the Xperia A2 with model number SO-04F, which was also launched globally as the Xperia Z3 compact.
