The thing to consider is that the govt has already legalised gathering of meta data. Your mac address is liberated once you enable bluetooth. Your IMSI number is tied to the sim card your service provider issues. These are both included in meta data as is the IP address.
If you have your phone configured to fli to wifi data use on a home network your phone mac address will be seen as an IP address and the ISP will primarily see the router mac address instead of the individual devices, but if you have an ISP supplied router your syslogs will be transparent to the ISP and govt, so a second firewall wi-fi router is a good idea if you don't want prying eyes. If you are running DHCP your mac address and IP address are logged. IPv6 exposes the mac address, so something to think about when configuring your modem.
