Does the 1000 minute limit apply to each country I call or all countries I call?
The limit applies to all countries that you call. Calling 500 minutes to China, 250 to Singapore,
and 250 to Canada would use up your 0 cent rate the same way that calling 1000 minutes to China would.
The currency is US dollar. For example, 5¢ means 5 USD cent per minute.