I had a friend who was incarcerated for a time; he sent me a message from the "jail-approved" platform smartjailmail. In order to respond I had to purchase credits - each message I sent was 50 credits and I could include "return postage" (sending them 50 credits to reply) with a max of 2000 characters per message. Pictures cost 100 credits to send. The minimum number of credits that I could purchase was 500, and all transactions included a payment fee of a few bucks. Glad to see this changing as it struck me as a very predatory business model.
Yeah, it's still like this at most places. I use this system every day to communicate with a lot of inmates in prison, trying to get them information from the Internet, mostly legal topics, but also MCU news :)
