Unlimited mobile-to-mobile?
I'm looking into getting unlimited mobile-to-mobile for my T-Mobile phone, and I just want to know something. The print says unlimited mobile-to-mobile when calling a phone on the t-mobile service, so does that mean ANYWHERE in the US as long as it's a t-mobile service phone? I don't want to sign up and find out it's for people only in my state or coverage area.
Now for another question. If I have unlimited mobile-to-mobile and the other person doesn't, do I have to call them in order for it to be free for me or will it be free if they call?