Ok, so I have a deactivated Eris. I already know I can do anything I would normally be able to do on regular wifi. However, I was at first under the impression that all my GPS capabilities would be gone. That being said I found a post that said that GPS would work, but aGPS wouldn't. So I went through and read about the differences and, as I understood it, all aGPS does is make the phone acquire a signal more quickly. Is that right? The main reason I ask this is because I want to use apps like RunKeeper/Cardiotrainer, but I don't want to risk bringing my current phone with me and dropping it while I run. So would I be able to still use the GPS for an app like that on my old Eris without Verizon service? In addition, my gym only allows cell phones in certain areas of the gym, so I figure they won't mind it if I use a deactivated phone for JEFIT or something since it can't receive calls.