How many times can they use the phone a day

County jail and state prison inmates can call as much as they want. As long as there is money on their books they can make  calls. In federal prison, the inmates are limited to 300 minutes per month (400 per month in Nov and Dec as a holiday bonus). InmateAid can make the calls less expensive if you talk often. Plans start at $8.95 per month, no contract, no hidden fees.