How do I check/know how much data I have left (including rollover data)?

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How do I check how much data I've used and how much data I have left to use for the month? It always just says you're on track or you have data to give but I haven't seen it show how much data I have in a simple way. You can check your data usage but I dont find that accurate either. And what about rollover data? Doesnt that mean that any data I haven't used I have added to my initial data of the next month? (Does that also include data from upgrades??) And how do I check how much rollover data I have.
Thanks!

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