Switch to a Sprint prl
All thanks to Koumajutsu for letting me use his tut
1) Turn on USB Debugging in the Settings > Applications > Development menu
2) Change your "DM" mode to USB on froyo
__a) Get your MSL: "adb shell getprop ril.MSL" (if you don't know how to use ADB, ask for help before following this)
__b) Enter the DM menu dial ##8778#
__c) Enter your MSL
__d) Select USB
To change your phone to DM mode for gingerbread
__a)Dial ##7678#
__b)Enter your MSL
__c)Select DM and your phone should reboot in DM mode
5) Open CDMA Workshop and select the serial port for your phone (In device manager, under Com ports, or Serial Ports, or something containing one of those words in the name, you might have to check the advanced tab for the device itself)
6) Click Connect
7) Under the security tab, Select Samsung (Sprint) for password (Samsung (Universal) on older versions of CDMA Workshop)
8) Click Send
9) On the Other Tab, click Send in the PRL box
10) Browse to the PRL file you downloaded elsewhere
11) Set your DM mode back to UART (See step 2)
12) Reboot your Phone.