The carriers’ greatest challenge is to recreate their walled gardens, albeit with invisible walls this time, around differentiated services. Outdoing the over-the-top majors with better apps and brands is a losing battle, but cellcos still have some weapons which are not available to those rivals ‘ the capabilities built deep into their licensed spectrum networks. These include network-based services such as VoLTE and LTE Broadcast, which could, if executed correctly, offer better quality and performance than OTT equivalents; and the ability to harness all the subscriber usage data to create personalized offerings and tariffs. So there are high hopes attached to VoLTE and LTE Broadcast to kick off a wave of network-based, high quality services, and while the latter can…