One complaint we've seen in regards to Windows Phone 7 is when people have tried to set up Wi-Fi on their secured home network. In short, there is no easy easy way to grab your MAC address for configurations that require it.

Luckily in this case, the Samsung Focus is different from the others by having a diagnostic screen that reveals this info. The directions are easy enough, as described by Mobility Minded, reminiscent of older tricks from Windows Mobile:

  • Go to the Phone section (as if you were going to make a call)
  • Enter ##634# and select “Call“
  • It did not call anything. There should now be a “Diagnosis” option on the top of your screen;
  • Go to Diagnosis and a keypad comes up and enter *#1234# –It should bring up a menu that includes the WiFi Mac Address

Source: Mobility Minded; via wmpoweruser