My phone is an Android so I use the Data Witness app graciously provided by our very own @IWIK.
My wife and daughter have iPhones. I've been reading up on apps to track 90 day plans, and I have determined that My Data Manager will do the job. Tried it on my Android and it seems good. Do any of you use something on your iPhones that you consider to be better than My Data Manager? Any issues like too many ads, innacuracies, etc.?