I don't think landline or mobile makes a difference. Here is a link you can read more about it. Scroll down about which countries you call and which you can text.
How do we know for sure it covers both calls to landlines and mobiles? Although that page is quite detailed it does miss that important piece of information. For clarity it should specify; we all know the management and communication tricks of omission. 😉
In relation to International Calling: Will I get billed if someone from outside the US calls?
Some carriers charge for making an international phone call but also when receiving international calls.
Is Receiving International calls included in the 500 min package ?