getting permissions and reading device data

Hello

In my unity based app, I want to read all phone contacts, get devide data (like sim number, phone number etc.) and also use some other permissions as well.. in android studio I can do this code in a few lines, but in unity I am clueless, and I have searched a lot in the web but found nothing...

I understood I need to declare those permissions on a manifest file so I can do it with android devices, but how do I declare those stuff for iphone users? and what is the actual code to retrieve this data with c#? (again, with android studio it's in a sec, but in unity I am stuck)

thank you for your help