Telcos have been joining forces to provide national or even global IoT coverage, however reluctantly, and in some cases spinning IoT out into separate companies. The aim is to encourage convergence or establish ubiquitous coverage in terms of geography and wireless protocol. Most recently, BT has launched a UK-wide IoT roaming service featuring both the cellular low-power WAN (LPWAN) options – NB-IoT and LTE-M. The former handles low-bit-rate applications and the latter operates where rather more bandwidth or capacity are required, as in CCTV monitoring. BT is offering IoT roaming not just through its own EE national cellular network, but also, where necessary, over infrastructure managed by its UK rivals such as Virgin Media O2, Vodafone and Three. This is…