Does unlimited talk/text plan include calls from a CA prison?

No you won’t be charged for any received call no matter where it is from unless it is placed as a collect call and you accept the charges. In that case, you would first be speaking to an operator informing you it is a collect call and asking if you accept the charges. I have no idea if inmates can make collect calls, though.

No. Are inmates even allowed to have their own phone? I've never heard of that.

Oh wow this is embarrassing! I worded it completely wrong. Sorry, English is not my first language. I mean to say:

I have an unlimited text/call plan and I am expecting a phone call from a relative who is an inmate held (in the same state I reside) at a CA prison. Since I have the unlimited plan, would I still be charged for the call? I have no experience whatsoever with the prison call system so I’m at a loss.

I hope this makes sense better.

Ah, I see. No problem. :-)

To answer your question, no those calls are not included. Call from prisons are made using special systems, usually collect calls, so you will be billed additional. 

Makes sense great! Thank you so much!