Upper West Sider Annabella Hochschild will admit: Buying a $375 iPhone case made from real fur was “deeply unnecessary.”

But for the 23-year-old book editor, the comically extravagant fashion statement by local designer Nina Cheng was also “deeply personal.”

“It was something I knew no one was going to have,” Hochschild says of the fox-fur case, which cost more than what she paid for the phone itself. “There was a real uniqueness to it. [Your phone] looks dull in your hand, and this makes it fun and something that expresses your personality.”

Smartphones are expensive enough, but a handful of New Yorkers are willing to drop even more cash — sometimes in the thousands of dollars — for a fashionable adornment to their devices. High-end designers are seizing on the rise of selfie culture and releasing their own lines of upscale cellphone cases.

Luxury retail site Farfetch has seen a triple-digit percentage increase in sales of cases from the likes of Dolce & Gabbana, Givenchy and Marcelo Burlon since September 2015, according to menswear buying manager Reece Crisp.

“People now use their phones as they would their computers, and some even use it 24/7 for work,” Crisp says. “So they want to make an impression in the accessories they choose — it’s an extension of their image and their personal style.”

Most of the cases on the luxury market are designed for iPhones — fittingly so. IPhone users tend to be more concerned with status than their Android-using counterparts, according to a 2016 study in the journal Cyberpsychology, Behavior and Social Networking.

Along with more well-known brands, indie designers such as Cheng are catering to an upscale market of cellphone-obsessed fashionistas. Cheng’s “Wild and Woolly” cases, like the one Hochschild owns, cost between $325 and $415 a pop, and she has sold nearly 100 since launching the line on her Web site, WildAndWoollyNY.com, in late September.

“The first night I took it out, everyone was asking me who made it and asking if they could take a picture,” Cheng, 30, says. “Within an hour of me going outside, someone offered me money to get it for himself.”

Makeup artist Ann Benjama didn’t exactly need her $275 custom Vianel crocodile-skin case — but she wanted it. The gratuitous accessory was a gift from her boyfriend and is emblazoned with the date they met. It’s become the emblem of her personal style.

“This case is very minimal and goes with my looks,” says the chicly dressed 28-year-old from Brooklyn.

Designer Brionn Anderson Green jumped on the luxury phone-case bandwagon when she realized people were willing to drop hundreds on unique and glamorous ones.

She started designing intricate, sparkling pieces, completely covered in vintage jewels and genuine Swarovski crystals. After selling to family and friends, she began marketing them on her Etsy page about a year and a half ago, each between $425 and $465.

“I could do this full time,” says the Austin, Texas-based designer, adding that her customers often view their phone as “a piece of jewelry they can wear every day.” It’s on display front-and-center, in all their interactions, so to them “the price doesn’t matter.”

One of Green’s customers, Midtown resident Sara Miller, puts the case on before going out for happy hour or parties. She dresses plain during the day, and doesn’t spend much on shoes and accessories — so shelling out $475 on the case is her way of making a statement. When she replaces her generic phone case with Green’s glimmering design, she feels like she’s putting on Cinderella’s slipper, she says.

“It’s a good investment to me,” says Miller, a 38-year-old beverage company manager. “The old saying is that you get what you pay for.

“If you really like it and it makes you happy, then it’s worth it.”