Confused about data usage?

[EastLothian01]

I wonder if you can help me interpret my data usage?

I received a message saying I had used up my 8Gb data. However, according to my phone, I have used 3.7Gb mobile data and 8.4Gb wifi.

My understanding was the my data bundle was for MOBILE data, so I thought I had only used half the amount.  I thought that wifi data was not considered to be part of the 8Gb allowance.

I tried contacting  customer service but the person couldn't understand my question and kepts saying that I'd used the data.  Perhaps I have.  I'm just trying to clarify my understanding as I'm quite confused now!

Thanks in advance for any info you can provide. 

[MI5 · Accepted solution]

@EastLothian01 

It is only mobile data, not wifi.

Check your MyO2 for an accurate report http://www.o2.co.uk/myo2 

Your phone may not have the correct billing cycle entered so could be reporting usage incorrectly.

[EastLothian01]

Thanks for your reply @MI5 , I hadn't thought about the data cycles being out of sync.  I'll be sure to double check that.  Seems something isn't right somewhere.