smartphone batteries will go out much, much sooner than a RPi SD card write-life. And nowadays they are much harder to replace.
FWIW I have several Pis running 24x7 and have not had a single SD card failure. I usually buy high end cards but I also buy cheap cards (4GB cards)and a few Micro-Center house brand, for which I don't know the quality.
I've had one that has been running years, I think. Drives a monitor, looping a video where my wife works.
The only SD card failure I have experiences was in a camera.
Early iterations of the RPi boards apparently had some bad design choices in the power circuitry, which makes the problem worse.
I have three RPis in abusive conditions, and they haven't had a single SD card issue. Two RPi 3b's running as a car entertainment system, with no form of battery backup/safe shutdown. They are on the ignition power, and once the car turns off, they hard shut down. These have been in place for nearly 2 years with the same Samsung Evo 16GB cards.
The other is attached to a digital signage with less frequent hard shut downs, but still has at least one per week, and been in place since late 2017. Also running a Samsung Evo card (I think it's a 32GB since that's what I had on hand).
Both have high quality power supplies, which may help. The in-car systems have Anker car USB chargers that have been de-cased and soldered in place, while the signage one has an Anker wall charger and a standard micro-b cable.
The failed ones were all running media servers with actual media storage on external drives, but indexing done on the SD card.
I ended up aggressively moving write loads to external storage and most of my RPis are running with read-only mounted SD cards these days.
The cards that die quickest for me are either written excessively like a GoPro or Pi based data loggers written constantly. The GoPros are just burning out the cards but the data loggers corrupt the disk images during unexpected power loss.