The number and variety of wirelessly connected devices is booming. Yet across all operators, service plans for both voice and data are about devices--not subscribers, writes industry analyst Monica Paolini. While there are some workarounds to this problem--most notably by turning a smartphone into a WiFi hotspot--setting up multiple contracts and managing multiple connections is complicated, which could discourage both the sale of devices and connectivity features. Multi-device subscribers need plans tailored to fit their overall individual requirements, thereby allowing them to use different devices at different times and in different places. Commentary