Blac Chyna Tweets Out Rob's Number

Blac Chyna just pulled the ultimate move to ensure Rob Kardashian won't have any more "bitches" texting him ... blasting out his number to millions of people.

Chyna posted a tweet Thursday night giving the world her soon-to-be hubby/baby daddy's digits -- and by the looks of things -- Rob's in on it. Chyna also posted a video with Rob explaining her move ... saying too many old chicks keep texting Rob, so the best way to get rid of them is to force him to change it.

You'll remember, Rob posted Kylie's number earlier this week after a baby shower planned by his sisters took a nasty turn.

You can hear Rob's phone blowing up with texts in the background of Chyna's video, so it's safe to say he'll be getting it changed VERY quickly.

Talk about a bold, but effective, strategy.