I'm getting the Dexcom for my 8 year old daughter. (Very excited) I have a few questions. We plan to just use an iPhone. Since we will be purchasing her a phone I'm going to try and get an older version so it's a bit cheaper. I also want the option of the sharing feature. Anyone have an idea of how much data the app uses? I'll try and get her hooked up to wifi at the school at least. It might be shotty though. Also for her sports, if I don't want her wearing the phone ... how quickly would the app pick back up readings once in range again. I'm thinking soccer for instance. If she comes off for a shift and sits in range to her phone will it update where she currently is quickly or if it has been out of range is this quite a process? Thanks for any info any one has.