I've commented on here before how women's clothing generally doesn't have large-enough pockets for smartphones. A lot of modern women's clothing is form-fitting, and has small pockets.

So either you revise the clothing or add some kind of wearable bag/pocket.

Used to be that women wore dresses, had slits in the skirts that they could reach through, and then had sorta wearable pockets on beneath them. But full skirts are pretty dead now, so:

https://en.wikipedia.org/wiki/Pocket

By the 17th century, pockets were sewn into men's clothing, while women's remained as separate tie-on pouches hidden beneath skirts.[5][6]

In the 17th to 19th centuries, women's tie-on pockets—mentioned in the rhyme Lucy Locket—often carried everyday tools like scissors, pins, needles, and keys.[7][8]: 113 

In modern fashion, men's clothing usually includes pockets, whereas women's clothing often has smaller or even fake ones, sometimes called Potemkin pockets after the concept of a Potemkin village. A 2018 study by the Pudding found that fewer than half of women's front pockets could fit a thin wallet, let alone a phone or keys.[9]

When I first ran into this, I thought "well, put the phone in your purse then, dammit, you're already carrying that for feminine hygiene products". Problem is that women don't haul (bulky) purses everywhere

walk into the office, say, set down the purse at the desk, and it's mostly staying at the desk. I don't know any women who wear their purses around the house. But they do want to keep the phone available all the time.

And the smartphone is a pretty ubiquitous item to want to carry around now.

So unless women's clothing changes to have large pockets and somehow deals with not messing up the body's silhouette or whatever makes that a problem or the smartphone form factor changes ("big smartwatch?"), I expect that people have to wind up with some kind of mini, wearable container. Like this.