They don't detail which phones but maybe a call to their support people will give the info. Also It looks like the carriers have limited the free internet Skype and on the BB they use the minutes. Not sure but here's another site that may be what your looking for. It seems like greed as set in.
Ok, doing some further reading I find the carriers have severely limited Skype on the mobile phones including Blackberry. Apparently they use the cell minutes and the charges are not as low for international calling as they are on a PC. So it may be something you will have to be careful with unless the cost seems low enough for your needs.
Also Skype has partnered with Verizon to offer the service so I see why they use cell minutes.
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Why don't you try something else instead?
Like BerryMiser from mobilemiser.com
It's a killer app downloaded directly to the BlackBerry that seamlessly integrates with the address book. Make calls as usual and slash your cellular bill by up to 80%.
They're reliable and they have really low rates so give it a try!