How to update iOS on iPhone 15

Hello,

Thanks for reaching out to Apple community support.

There has been ongoing issues with iOS update 17.4 .1 and I recommend completing this update via iTunes or consulting further assistance from Apple support.

I have attached an article below to help you update your device using iTunes.

Update software on iPhone, iPad or iPod touch in iTunes on PC – Apple Support (AU).

Just so you are aware iOS 17.4.1 has been closing ongoing issues with mobile cellular and other software related issues.

Take care,

Apple Community