Some 3,800 Big Apple motorists were nailed yesterday for using their cellphones while driving in an NYPD crackdown.

The summonses were issued during the first part of a routine 24-hour dragnet designed to stop motorists from chatting or texting up a storm and endangering drivers, passengers and pedestrians, police said.

As of 6 p.m., cops had tallied 3,753 summonses. During the last ticket blitz, on Jan. 21, they handed out nearly 7,500 to chatty or text-happy drivers.