The "Choose a mobile network" UI performs a network scan and, upon the completion of the scan, populates a list of networks (MCCMNCs). Choose a network from the list would result in registering to the selected MCCMNC. If the action fails, it will fall back to register to the home provider In either case, the current implementation doesn't actually create a IP connectivity (it simply registers to the selected network. We can should change the behavior of the "Connect" button to perform both Register and Connect.
Comment 1 by steve...@chromium.org
, Aug 21 2017