Question Request Assistance Force Roaming on G2 (LS980)

I would like to know how I may roam exclusively on my Sprint LG G2 LS980. I tried roam control, but does not seem to work on the LS980. I tried that app on two different phones and the screen remains black. The reason for the request is that I would hope to roam so much data that my provider will have to cancel my cantract/service without an ETF as Sprint can modify there contract and the customer must accepted it or cancel their service.

It would be great If I can modify my PRL to roam verizon's network. for data and voice.