OK so it's really easy. I did it by mistake ish. What you'll need is lg motion (not sure ifyou need root or not I have root) 1 New SIM card from the new network. I used one from an lg optimus l9 that I bricked. And just insert the card into the phone and boom. My motion is fast as hell now so if u don't want to buy a phone on the new service just grab a broken one from eBay and use that card.