Oregon Military Dept phone number?

So my boyfriend is in the Navy and currently stationed in Spain; he calls me at least twice a day. Since my mother pays for half of my cell phone bill, she started kinda freaking out because she said that she hopes that we're not being charged for it. He explained it to me but I don't remember, but I guess he calls into the Military Dep't in Oregon because that's the number he calls me from so will I be charged for an international call or not?