Hello dilijasi,
At the URL
VIPonline I read the following:
"When using data services, the time spent on the network is not charged, only the quantity of data transferred. Price does not depend on the technology of transfer used (GPRS, EDGE, UMTS or HSDPA). The calculation unit is always 10kB."
However, it speaks a lot about how to use these data packs with your phone's browser.
I do not think it is restricted to GPRS/EDGE, but I do hope that these data packs are not using a different (WAP-only) APN ...
I will call and ask them.