https://techround.co.uk/tech/dumb-phones-making-comeback-why/
A person could have a very basic cell-phone as their actual phone & text device with a SIM_card, then have a smartphone for video and free Wi-Fi access.
Several people like to have a Dual_SIM in their smartphone, but some people might like to have a sim card in 2 phones.
https://www.laptopmag.com/phones/dumbphones-in-2024-social-media-trend-or-something-more
Instead of carrying around 2 nice & big smartphones, one of them could be a basic cell-phone.
https://www.cape.co/blog/best-dumb-phones-of-2024
Some people will carry a portable-charger or a power-bank with them to recharge their smartphone late in the day when away from home. Of course a basic cell-phone will last throughout the day.
https://www.bbc.com/future/article/20240515-the-dumbphones-people-want-are-hard-to-find
However, by just having a basic phone for calls and texting, then they could still have a smartphone for pictures, video and web browsing. Thus, by doing that will likely reduce the need to always carry a portable-charger.
At the end of the day, some people will always prefer to have their all in one smartphone, but some people will just want to have a basic cell-phone.
https://digidetoxing.com/what-is-the-dumb-phone-trend-in-2024
https://www.pcmag.com/picks/the-best-portable-chargers-and-power-banks