So, better to start with the question – why do you need calibration ?
1. Screen each device is unique, in addition to this, users adjust the brightness.
2. It's best to look official position of Apple in color
Links inside, will help you understand what colors best to use and what to evaluate when selecting colors.
3. There is Mirroring software, for example using Figma can be directly on the phone look what happens
I mostly himself sitting behind a great screen because I'm resting my eyes and then in the process sometimes check on the target devices, which are slightly worse.