Additional data usage on my bill for IPhone 7

[Iuliaa]

I am a post pay user. This month on my bill it appeared an additional usage of data mobile, to be more exactly 6 Gb.

In my settings on data usage is 29.7 Gb from 7th October 2016 to 26th March.

Is there any way chance that my iPhone is tracking correctly the usage of my data mobile, so I can ask for each bill from October to now to see what was the data mobile usage that appears in the bills?

Thank you.

 

[Old Goat Ninja]

I have a 7+ and it tracks my usage accurately. Every month on the cycle start/end date I reset my cellular usage, and it's always spot on to what Verizon shows I used. We have a family plan with 4 people that share data, so I'm always aware of who's using what, etc.

 

[Iuliaa]

It's the only way I can prove that is a mistake in my bill.

In my deal with the provider for the post pay it was 6 Gb/ month. From October until now in 5 month it would be around 30 Gb.
My iPhone says that I used 27.9. But in the last month in the bill appears additional data usage, apart from my 6 Gb, others 6 Gb.

I can take my iPhone data usage on current period as the proof but I wanted to hear from someone that it tracks correctly.
Thank you.