NUMBERS GAME: If you live in Brea...

NUMBERS GAME: If you live in Brea and wonder if you are changing area codes Saturday, there’s an easy way to figure it out: Only those already in the 213 area will switch to 310. That means Seal Beach, La Habra, Los Alamitos and those in Brea north of Lambert Road but west of Puente Street. . . . “We have a permissive period of six months, where you can still use 213,” says Pacific Bell spokeswoman Linda Bonniksen. “But we’re trying to get people acclimated to the change.”