Disparity between Data Usage on device and on account

[Anonymous]

Hi all,

My device shows that I have used 1.91GB of my 3GB data allowance but MyO2 shows that I have actually used the full 3GB.

I know that there is sometimes a difference between the device and the network records, but this seemed too much to me. Until recently I had been happily bobbling along with 1GB until I discovered Spotify and upped my allowance to 3GB when I upgraded.

I called 202 and they said that this difference was taken up by background updates hence why it wasn't shown on this screen. I did actually use the O2 Chat service when my 80% text arrived and they said that it was caused by me changing my billing date the week before.  Does the answer I had from 202 sound feasible or am I having the wool pulled?

[MI5]

If you changed mid way through a billing period your allowances are pro rata for the first month.
Background data usage would still show on your phone.

[gmarkj]

Forgive my naivete, but does the data from o2 include uploads while the device only show downloads?

[MI5]

Device is total date use either up or down.
Mine is always within a few mb of each other.