Any phone card that will work on a pay phone will work. Your recruit is also able to purchase one on his own at the NEX. See Phone Cards and Phone Calls.
Carol K, Yes, recruits must use phone cards to make calls from the RTC. Your recruit can buy one at the NEX is she did not take one with her. Yes, she is able to make calls to cell phones. See Phone Cards and Phone Calls.
Check your My Page.