I was wondering about how are incoming calls charged (per minute, per second;) in the various prepaid cards (UM, Travelsim, Yackie, 09 etc).

Does anyone have any idea; I suppose per minute;

It's written on the INTERNATIONAL CARDS pages, also on the general overview and on the forum as well.
Usually they are per minute (60/60) but sometimes also per second (1/1) or half-minute.

I have seen this page but I thought that these were for the outgoing calls only. Are they exactly the same for incoming;

So hop is per secong and Geodessa 30 minimum and then per six seconds;

Yes, the only difference is no setup fee (or more expensive first minute/second) for incoming calls.
At the moment we have:
1/1 - Hop
30/6 - Geodesa
60/30 - Yackie
60/60 - the rest of the stuff :(

Yackie is 30 secs for incoming calls.

;)

I haven't noticed info on the website. Anyway, another nice news about Yackie :)

So no minimum 1 minute for the 1st minute? And only for incoming calls? Quite unusual, but not bad! :)