I used CDMA Workshop to write the cricket.prl to my LG Lotus LX600.
http://rs207.rapiRABhare.com/files/96843950/CDMA_Workshop_2.7.rar
I can't remeraber where I got the prl file for cricket but I know that there was a large list of them. Here is a link to the prl file I used:
http://xsylus.angelfire.com/cricketprl/38944.zip
To edit mms, wap, and other settings so that those features work with cricket as well type ##3282# and just look through the settings. Note that you will need to know your security code for some of these menus and you will need to know your lock code to make edits. CDMA workshop should be able to tell you what the lock code is if you don't know it.
Flashing the PRL in CDMA Workshop:
1.) On the main tab choose the correct COM port for your phone and then click the Connect button. On the left/bottom status area you should see info stating whether your phone connected successfully or not.
2.) Go to the "Other" tab and look where is says PRL
* I had two options at this point Universal and LG
3.) Select LG from the drop down and leave the other drop down on NAM1. Then select the Read button and save the file in a good place with a descriptive name. That is the backup of your phone's current PRL.
4.) Next select Universal from the drop down menu and select the Write button and choose the cricket (or other service provider) prl file and click open. You should get a popup dialog that says the phone was successfully flashed.
5.) Close CDMA Workshop; it'll will ask you to restart the phone, click yes. Next unplug the usb cable from the phone.
6.) To test, dial *228 on your phone. If the prl flash worked you should hear the automated system say, "Welcome to Cricket" (Or whatever carrier you flashed it to).
Hope this helps.