How accurate is the Iphone data usage tracker?

I have an iPhone 4. Right now i have an unlimited data plan that i was grandfathered into, but i now don't think i need. I went to settings, cellular, on my iPhone, it says the last reset was september 18, 2013 at 6:53pm, and it says my cellular data usage is 288MB. Does that mean that since september 18, i have used 288MB? I'm thinking of getting a 200MB or 300MB data plan thats cheaper, but don't know if thats what i need. I don't want to go over my data limit.

Did you know that if you go to setting app- general-usage- cellular usage it will tell you your data… It is precise but you have to reset it every time your data resets

  • Unknown data usage on iPhone 4S? My family and I all have smartphones (all iPhones except one) and on our phone bill, it says that we're already at 6.7 GB, in 15 days… Looking further into it, I noticed that on each phone, data was being used every hour. Like anywhere between 1 and 19, 000 KB being used exactly every hour. Like 3 KB at 1:49, 15 KB at 2:49, 7 KB at 3:49 in the morning. KB's aren't a lot, but when you have 6 devices using KB's every hour, it really adds up.
  • Under settings on my iPhone, does the data usage include Wi-Fi usage? Because its stating a ridiculous amount and I've had my data off… And my Wi-Fi on. Does the total of data include the amount of Internet I'm using when on Wi-Fi? I'm so confused
  • Is tbere any major différence between thé iPhone 6 and the 6s? Whooppeee is Xmas again and my daughter wants new 2nd hand) iPhone… 2 years ago almost bought her 5 before i réaliséd that it was 5s she wanted ( cos thé 5 sucks?) And I don't want to screw up this year…
  • IPhone: settings cell usage vs AT&T's data usage number? AT&T has a number, by calling it will send you a text message telling you how much usage you have used on your data. But also in the iPhone there's a cellular usage count in the settings app which also tells how much data you have used. Both of my cellular usage counts are different. Which is right?