Default Samsung Mesmerize Prl changing and more
Samsung Mesmerize Cdma How to's

download your drivers for the mesmerize found on samsungs website
download a cdma flashing software like cdma ws or dfs.
download the prl of your choice carrier or who you would like to roam off of(read and know roaming limits of your carrier before writing to phone which can result in termination of your service)

Getting your spc code and loading a prl.
1.connect phone to computer in diag mode do this by dialing ##8778# on the phone change them both to usb if not there already.
2. open the flashing software of choice for this guide I will use dfs.
3. click ports at the upper right of the main interface of dfs and double click the port with diagnostic in it and exit the add port tab.
4. you should see yellow on the screen on the equipment tab
5.in the box with all those f's delete them and put this 2010031619780721 in that box and click pwd and it should say device unlocked in blue.
6.next go to the programming tab sub-tab general and press read next to spc under unlock you now have your spc copy that to the box with all 0's next to the pwd where the f's was then press spc to the left of your pasted spc.
7.go to nam tab to the left you will see prl click load choose the prl file you downloaded then press write.
8. reboot your phone and your prl has been changed be sure to make a backup of your original prl just in case you need it.