I currently have a Droid RAZR M and bought a brand new Droid Maxx from swappa a few days ago. It's scheduled to arrive today. I plan on activating it with a new SIM tomorrow. I need to keep my Razr M active for data only for a while, and when that project is finished it's going to be my family spare. I don't want to do a FDR, just have the phone available for use if needed. I know a lot of people post in here & other forums that they have several older phones that they use as WiFi only devices. What's the best way do that? Just turn off Mobile Data and leave WiFi on connected to my home router? Is that all there is to it, or does the SIM have to come out of the RAZR M also so it does not try to connect to Verizon for calls & texts? When I replaced my Bionic with the RAZR M, I did a FDR on the Bionic instantly and then realized that I can't use it for anything now without activating it on the network and want ot avoid that this time. Just looking for some pointers form the folks that do this often. TIA.