To accept calls from state prison inmate on cell phone, you should obtain a credit card or a bank card. This is because you have to provide the credit card to be billed before the call is connected. You can also find a 3rd party provider to place the call for the inmate. Go to http://www.ehow.com/how_7648908_accept-calls-inmates-cell-phone.html for details.
Call your carrier...I believe this is a feature you have to have added i.e. ability to receive, accept/deny collect calls and ultimately pay. But keep in mind, you're going to pay a pretty penny for those calls...should ask what average tolls may run you.