These are some good tips I found from www.knowyourcell.com Reduce the time before the screen turns off You can set your Samsung Focus to have a shorter screen time-out duration and set your phone to lock automatically so that large 4-inch screen doesn't drain power. To do this, swipe left...
AT&T Tethering on Samsung Focus (SGH-i917)
Make Sure you have Zune installed on your PC and then perform the following steps. This will disable the Zune Sync feature via USB, and enable Modem. Put the phone back into Diagnostics mode and select Zune sync to re-enable the sync. Dial ##634# Once Diagnostics opens, Dial *#7284# Switch...