Xi reached four million subscribers just one and a half month after it surpassed the three million mark on June 8, 2012. The appearence of Xi-compatible smartphone lineup in summer 2012 nearly doubled the pace of new subsriptions.
DoCoMo expect to attract customers even more with the plan of Xi Talk 24 for free - unlimited voice calls between Xi-compatible smartphones. \pipelinepub.com
LTE connections globally surpassed 22 million as for the July.