Vlad,
the vodafone website isn't exactly clear on the cost. the price tiers you mentioned seem to be for the USB card:
https://www.vodafone.ro/personal/int.../index.htm#id2
while the section that clearly mentions internet on the mobile handset only offers prices if 1) you are an existing vodafone subscriber or 2) if you are a USB card user:
https://www.vodafone.ro/personal/int.../index.htm#id2
do you interpret the website any differently? or better yet, have you personally used a vodafone SIM card in a handset and paid according to the price structure you posted?
thanks!