BEFORE they start talking...

...tell them you don't need a full description, you just want the facts, so get to the point immediately, or you will leave/hang up.

If you can't do that, then after they've been speaking for about two minutes, interrupt them! Say "Excuse me! You've been talking non-stop for two minutes! I'd like to say something too. Or were you just lecturing me and this is not a discussion?"

I know it sounds harsh, but it is not. You are just pointing out their errors in polite communication. Like having someone walk past you on the sidewalk and as they do, they shove you. So you speak up and say, "I beg your pardon!" or something to that effect, calling out their RUDE BEHAVIOR.

Your friend is RUDE. Selfishness is at the heart of rudeness. Confront him and help him to think of others, and break this very bad habit. You'll both be glad you did.