Friendly retail
A friendly retail location is one that assists Consumerium Service access for its customers. There are potentially "very friendly" retailers who also install healthy buying infrastructure specifically to deliver the Consumerium buying signal reliably. These are expected to be few in number.
Probably the GSM networks (say based on Python integration of worn devices with too much brains) are deployed as the pilot solution, but over time, simpler/dumber devices receive audio signals from large servers, and the entire solution becomes both eyesfree and handsfree for users, quite important at retail shelf and checkout counter where eyes and hands are usually busy.