You can check the interfaces you have with
ifconfigThis will show you the status of the currently active interfaces. From there you should be able to see which one is actually broadcasting the local network. Although I'm not sure if the new interface is automatically detected and used as default instead of the on-board one. If not,you may have to change
#Iw physical interface PHY_IF="phy0"phy0 to the name of the new interface.