Rick Pitino's phone was BLOWING UP Sunday ... the legendary hoops coach was seen giving out his phone number during the Knicks game, and lip-readers nabbed his digits, and wouldn't stop texting him.
Pitino was at Madison Square Garden to watch the team he coached from '87-'89 take on the Cleveland Cavaliers in Game 4 of their first-round playoffs series.
As is customary, the broadcast showed the vast array of celebrities in attendance at MSG, but when the cameras panned to Pitino, he could be seen mouthing his phone number while having a convo.