It's best that you activate the phone on Verizon's prepaid service FIRST. Once activated, connect the phone via LG Download and load a Cricket PRL into the second NAM slot.
To program the second NAM, you can either use LG Download OR use the ##PROGRAM10000, Send, then enter six zeroes, and select Service Programming.
If the Voyager is anything like my vx9900, NAM selection should be in the phone's settings under NAM Select. You should also be able to set the phone to Auto NAM so that it switches to the Verizon NAM any time you are outside the Cricket roaming area.
Cheers!
Bookmarks