Lou Diamond Phillips’ cellphone was recharging when his agent tried to call him with some good news: his Fox series, “Prodigal Son,” had been picked up for a full season.

Phillips didn’t take the call. Eventually, his boss, executive producer Chris Fedak, got through with a text.

“We all had hopes that we would get a back five, but we also didn’t expect it this soon,” Phillips, 57, tells The Post. “I was not in anticipation mode. I was a bit gobsmacked, to be honest.”

To celebrate, Phillips and his wife, Yvonne, went out for a nice lunch.

The fall season has not been especially kind to new series, with many relying on Live+7 ratings (viewership for the seven days following an episode’s premiere) to deliver passable numbers. “Prodigal Son’s” offbeat take on the standard network procedural, matching criminal psychologist Malcolm Bright (Tom Payne) with his father, Dr. Martin Whitly (Michael Sheen) — a serial killer unappetizingly known as “The Surgeon” — to help solve murders, has drawn viewers looking for something different. Phillips plays NYPD detective Gil Arroyo, Payne’s mentor who was also the arresting officer when his father was first carted away.

“When we get a new script, I read it out loud with my wife,” Phillips says. “When we laugh or something surprises us, I think the writers have really endeavored to be atypical. I’m incredibly grateful. The writers are underlining the history Gil had with the Whitly family and how it affects Bright’s development.”

The “La Bamba” star says he wouldn’t have been interested in signing on to the series if the premise had been conventional. He prides himself on having never been on a “down the middle show,” as he puts it. “Even ‘Wolf Lake,’ back in the day on CBS, was a weird show about a werewolf,” he says, with a laugh. “‘Longmire’ was a contemporary Western. We opened the door for ‘Yellowstone.’ When you do something like [‘Prodigal Son’], you hope there’s going to be an audience and embrace it. We’ve been very fortunate.”

Phillips, who is Filipino-American on his mother’s side and Scots-Irish on his father’s side, has played characters of several ethnicities in his long career. He was Mexican-American in “La Bamba” (1987) and “Stand and Deliver” (1988) and Native American in “Renegades” (1989) and on the Netflix series “Longmire” (2012-17), for which he traveled to the Cheyenne reservation in Montana as research.

In 1991, Phillips was adopted by an Oglala Lakota Sioux family and given the name Star Keeper. “Longmire” technical adviser Marcus Red Thunder, the inspiration for Phillips’ character, Henry Standing Bear, facilitated his adoption into the Cheyenne nation (in 2016) for his work on that show.

The process required Phillips to spend time with a tribal elder, a Cheyenne family and some time on the land. “It’s not a one-time deal,” says Phillips, who was given the name “Wolf” as part of his adoption. “It’s a commitment to being part of the nation as much as people.”

When Broadway staged a revival of “The King and I” in 1996, Phillips was cast in the Yul Brynner role as King of Siam. Critics were so impressed he was nominated for a Tony Award for Best Actor in a Musical. One wonders why he never followed that up with another Broadway show.

“That was such a special experience,” he says. “Not only getting nominated, but the show winning the Tony [for Best Musical Revival] and Donna [Murphy] winning and the show being such a success. I’d do it again in a heartbeat.”

“Prodigal Son” has brought Phillips back to New York so you never know where luck will find you. He drove seven hours cross country with his wife and 12-year-old daughter Indigo to set up shop and he’ll be here at least until next spring.

“The full season extends the lease I’m paying,” he says.