@mmaarrscus
Personally I just use the tools available to me in my phone but I also keep a good eye on my account and usually check in at 9pm pt (midnight eastern) on renewal to ensure my minute and data counters reset. I take a screenshot of my overview page just before (midnight) and just after.
I then change the date in my phones data tracker if the month previous had more or less than 30 days. Keep in mind that if like me you are not in the eastern time zone your phones data tracker can be off by up to 3 hours but since it renews in the middle of the night for most it is unlikely to be off by much.
I usually keep my data warning set to 25% of my plan data and the limiter to 50%. This way if you accidently disconnect from wifi or an app has gone crazy eating data from a nonstop video clip my dat will just stop before almost all of my plan data is consumed and pm sends out the 75% and 95% usage texts. If hou have add on data pm includes all of the data on the account before sending out usage texts.
There have been a few good third party data tracking apps suggested that give you a more hands off approach to monitoring your data usage decide which approach is best for you.
