I'd like to have my Pre 3 always dial out with Google voice so those I call see my GV number. I can do this manually by dialing my GV number, pressing "2" and then the number I want to call. There's a thread from early webos days that instructs how to do this automatically by modifying a script so the proper dialing prefix is inserted into all outgoing calls.
The Pre 3's file structure is significantly different from the original Pre and the files mentioned aren't in the same location (or are missing altogether). Is it possible to do something similar with the Pre 3? I suspect not, but thought it's worth asking.