I've been using mySugr on my iphone. it's easy to use, and kind of fun. here's our group for it
http://www.tudiabetes.org/group/mysugr
additional discussions on apps:
https://forum.tudiabetes.org/topics/13-best-diabetes-iphone-and-android-apps-of-2013
https://forum.tudiabetes.org/topics/10-best-iphone-android-apps-for-diabetics
https://forum.tudiabetes.org/topics/online-blood-glucose-tracking