how do I change from one apple id to another on my iphone?
It's an older Iphone SE that I gave my kids. My son does not want it associated with his Apple ID. The phone will not let me sign him out, it says this is restricted.
iPhone SE
Have you checked Settings/Screen Time for any restrictions?
The best way to switch IDs is to do the steps in the article below and set it up as a 'new' phone.
You can also use the article below as a guide of where to sign out/in.
What to do after you change your Apple ID or password - Apple Support.