Vodafone prepaid sim Zoogerloos Internet Blox - VOIP calls with SIP client

[milokat]

Hi there,

I'll be in AMS for 10 days and am planning to obtain a Vodafone prepaid SIM pack for use in my iphone.
I would need experienced user out there for advise on the the Carefree internet (zoogerloos internet Blox) that can be activated with EUR9.50 (unlimited internet on phone for a month).

My question is, I'm an avid user of VOIP, like skype, nimbuzz and others on SIP phone clients as well, and I've heard that the Vodafone EUR9.50 internet blox addon does not support voip calls (or rather, Vodafone blocks it, is this true?), and one will have to purchase the EUR34.50 Vodafone Zoogerloos Internet Totaal Blox instead for VOIP to work, as indicated by Vodafone.

Any one who's used the prepaid service and successfully used VOIP on the EUR9.50 3g internet blox on the prepaid Vodafone sim?

If not, any kind advise would be appreciated (heard that there are other choices such as KPN pay per day internet access plan for prepaid?)

Jess