Default GNEX Without service

First I would like to thank everyone on this forum. Being a Noob to rooting I have learned so much here.
I will be picking up my new Galaxy S5 tomorrow and I want to keep my GNEX for a music player. I believe I will still be able to connect it to wifi and load it with music via USB. Any suggestions as to how I should configure it before I lose service?

I have Vanir ROM running 4.2.2 with DirtyV kernel.