As I'm sure most people know by now, typing "*#1546792*#" will bring up a service menu on the Blackjack allowing you to force the phone into 3G or 850 or 1900 band.
To create a speed dial shortcut, I used Resco Explorer and go to browser settings. Check UNHIDE all files. You will then see a file in the \windows folder called BANDSEL. Create a shortcut to that file, then a speed dial shortcut and you have a quick way to get to that menu. 8)