I think total usuage since I got my phone is around 30Mb

but I use wireless all the time for internet

i'm with t-mobile uk, had a text message telling me to stop last month, and thats a 3gig limit. youtube tv shows seems to be a pretty good way to kill allowance.

i work in mobile retail, and my manager downloaded 5.7 gigs using his phone to teather, t-mobile cut him off so he rang up to complain about it, and got a bill credit of £5 to cover the cost of his "unlimited" bundle.

I find Vodafone's products/pricing/conditions confusing

For my "Unlimited Mobile Internet", VF say:

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Unlimited Mobile Internet

The Vodafone Mobile Internet Tariff gives you 500MB data allowance per month. If you exceed your allowance, you'll default to the standard £1 per day charge for the rest of the billing month. £1 per day gives you 15MB data allowance per day. Once you have used up this daily allowance our standard charge for data access will apply (£2 per MB). You cannot rollover any unused monthly allowance to the next month. The data allowance within the Vodafone Mobile Internet tariff cannot be used for data usage abroad nor Voice over Internet Protocol (VoIP) services such as Skype or Peer-to-Peer services (such as instant messenger services, text messaging clients or file sharing).
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What concerns me is that my Internet allowance can not be used for: VoIP(Skype) P2P(sharing), IM, etc.

So apparently, VF can determine how to charge you based on the type/content of YOUR data packets. Which means they'd have to inspect every packet entering/leaving your phone ? I doubt it!
But, maybe time we need to start encrypting our data packets.

Thank god for Finlands network where limited data usage doesn't exists coming from cheapest to most expensive data plan.
Weirdest are some of the states data plans i have seen where you even pay for unlimited data plan, but still got some limit.