PHILADELPHIA — As Todd Frazier remembers it, the call came “an hour” after the news broke last January that he was signing with the Mets.

Already, the Mets were scheduled to face the Phillies in the Little League Classic in Williamsport, Pa., on Aug. 19, and the president of Little League Baseball, Steve Keener, was on the phone extremely thrilled a distinguished alumnus would be returning.

But the excitement was reciprocal.

“Right then I was like, ‘Oh, man, we are actually going to go there,’ ” Frazier said earlier this week.

Frazier is synonymous with the Toms River, N.J., team that won the Little League World Series in 1998. Against Japan in the championship game, Frazier went 4-for-4 — he led off the game with a home run — and was the winning pitcher.

Another alumnus of the event, Michael Conforto, played for Redmond, Wash., in 2004. Conforto is among the three players who can say they appeared in the World Series at the Little League, college and major league levels. Former Red Sox catcher Jason Varitek and journeyman reliever Ed Vosberg are the others.

“When Varitek was in the World Series with the Red Sox, I remember hearing about it, that he had played in the World Series at all three levels,” Conforto said Saturday. “And my dad saying that would be pretty cool because I had already been in the [Little League] World Series at that point.

“Then I made it to the College World Series [with Oregon State] and he said, ‘Now you have to make it to the major league World Series,’ and we ended up making it in 2015 and I became another one of those guys, a fun fact.”

As part of Sunday’s events leading into a 7 p.m. game at Bowman Field, players from the Mets and Phillies will interact with the Little Leaguers. Frazier, who was scheduled to arrive in Williamsport on Saturday night — the remainder of the Mets weren’t traveling until Sunday morning — will throw out the ceremonial first pitch before one of the Little League World Series games.

Frazier will have 12 family members in attendance, including his brother Jeff, who played for Toms River in the 1995 Little League World Series.

“Jeff got it kickstarted,” Frazier said. “I was three years younger. They came in third in the United States. I won’t tell him this straight up to his face, but his team probably would have beat our team. His team was really good. They had pitching, hitting.”

Frazier designed his own cleats for Sunday night’s game that will have the players’ names from his championship Toms River team inscribed on them. A mural painting will also be presented to Frazier and Conforto, showing their participation in the Little League World Series.

Frazier’s memories from the event include ping-pong matches with then-ESPN commentators Harold Reynolds and Jack Edwards and the friendship he forged with the legendary Brent Musburger.

“I still talk to those guys to this day,” Frazier said. “It was just one hell of a ride. It took the world by storm and we didn’t basically know about it until we got back home. We had a parade right away when we got home and thousands of people, not only from Toms River, but from around the world came and we felt like the world stopped for us, so it was a lot of fun.”

Conforto, whose team was eliminated early in the 2004 event, is most looking forward to the interaction with the Little League players.

“When you hang out with kids, especially in this season where we are at right now, it will probably jumpstart us a little bit,” Conforto said. “There will be a lot of energy.”