O2 online GPRS billing confusion

I've just taken a look at my latest O2 online bill.

I'm rather confused at their GPRS billing.

I use my Nokia 6021 to check and download POP3 mail, several times a day, 6
days a week. I have 1meg of GPRS included in my tariff.

Why are some downloads in between batches of inclusive downloads showing as
chargeable, and then back to some more that show F (included in tariff)..?

In other words, in any one billing period, I seem to have to pay for some
downloads, in between batches of inclusive ones. Most are only for 125k or
less....

It goes a little like this for example:

GPRS 25k F
GPRS 80k F
GPRS 75k 0.05p
GPRS 62k F

So, the third out of those 4 (in my highly simplified example would be
charged, the others either side not).

Si.

"Si" <notme@youdamnspamdevils.com> wrote in message
news:45577407$0$8712$ed2619ec@ptn-nntp-reader02.plus.net...
> I've just taken a look at my latest O2 online bill.
>
> I'm rather confused at their GPRS billing.
>
> I use my Nokia 6021 to check and download POP3 mail, several times a day,
> 6 days a week. I have 1meg of GPRS included in my tariff.
>
> Why are some downloads in between batches of inclusive downloads showing
> as chargeable, and then back to some more that show F (included in
> tariff)..?
>
> In other words, in any one billing period, I seem to have to pay for some
> downloads, in between batches of inclusive ones. Most are only for 125k or
> less....
>
> It goes a little like this for example:
>
> GPRS 25k F
> GPRS 80k F
> GPRS 75k 0.05p
> GPRS 62k F
>
> So, the third out of those 4 (in my highly simplified example would be
> charged, the others either side not).
>
> Si.
>

No one any ideas?

Si.