Don’t just make a black phone. Make it the blackest phone. Something like Black 3.0 https://culturehustle.com/products/black-3-0-the-worlds-blackest-black-acrylic-paint-150ml
There could be a lot more done with smartphones and colours that stand out. Audi learned this lesson and applied it to their range of cars. I reckon the same could apply to phones.
Not just black, either. There’s the Pinkest Pink https://culturehustle.com/products/pink-50g-powdered-paint-by-stuart-semple
And colours associates with a brand, such as Louboutin shoes, or Ferrari cars. Just imagine Nothing Black …