The calling rates depend only on the country of your stay. E.g. if you stay in China, you pay nothing for incoming calls and flat per minute rate for all outgoing calls. It does not matter where you call: to China, or your home country, or anywhere else in the world.
However, there are a few destinations with additional rates. If you call from anywhere to one of these places, there is an extra rate addition to an outbound call price.
There’s special rate of $0.19 for outgoing calls to mysimtravel numbers and to voicemail in the countries with free incoming calls. E.g. if you stay in Norway (where incoming calls are free), you call a friend’s mysimtravel or your voicemail for just $0.19. Even if your friend is in a country with charged incoming calls.
A text message costs $0.11 within the EU and otherwise mostly $0.35. Incoming text messages in all countries are free of charge.
You can download all rates in cost & coverage section. The prices are continuously falling, which means that you will be able to talk longer in the future for the same money.