Here I am back home!
Yes, I saw plenty of posters of Orangeclick.sk all around Slovakia, pity we couldn't meet in Bratislava, I was there yesterday for some hours, and I know where the Po?ta office is!
Anyway, I bought a normal "Prima" prepaid card from Orange and the international rates are exactly the same, and very cheap indeed. It was great to call back home at 5 SKK/min (? 0.135). Orange has almost a perfect GSM coverage and really a widespread 3G network too. PIty that Prima users cannot use the 3G (maybe Orangeclick yes, I have no idea), and also with Wind I couldn't register on it. I could register on T-Mobile SK 3G but no data connection was available, and it has coverage just in some parts of Bratislava only.
I had instead some problems in Hungary and I couldn't buy any prepaid card. In Budapest there seem to be no shops which sell prepaid cards! There's pleny of "GSM" shops which sell or repair phones, while you can get refills at newsstands but if you want a prepaid card you need to go to the official shops of the 3 operators. Walking around Pest I just found the Pannon one but it was so crowded that after 15 minutes of waiting (with no one speaking English inside) I preferred to enjoy the beauty of this city walking around and using United Mobile. I didn't see T-Mobile and Voda shops at all, but there were also no commercials of Voda, really incredible...
Outside Budapest it was much easier to find the 3 operators' shops since towns were small and shops were in the centre. Usually Voda had the best located ones (of course). But buying a card to use for 1,5 days was quite unuseful so I have no Hungarian cards. I had big problems with SMSbug as well there, with many "rejected" SMSes to one T-Mobile H number (of a pretty girl who I didn't meet!).
Talking about 3G networks, Pannon is the most widespread and I was always roaming on it with my Wind card. T-Mobile and Voda have some coverage in Budapest only as far as I saw. Speed was excellent both in 2.5 and 3G with Pannon and Wind.
Anyway Slovakia beats Hungary by far as far as concerning mobile networks (and O2 is coming with a 3G only one), while talking about pretty girls it's a hard match!