If you have an idea of which prison your loved one might be in, you can write a letter to them at that prison. Ensure you put your loved one's name and date of birth on the front of the envelope followed by the full address of the prison, your name, address and relationship to them on the back of the envelope. Within the letter you can include all of the phone numbers your loved one might need, as well as requesting their prison number which you will need going forward.