Not that I have been, but the US Jail catalogue has lots of devices that are analogues of what we have on the outside. Except they're expensive, lack the normal functionality you would expect from even the most basic version of said device and are made from see-through plastic to prevent people hiding shit in them.
If Ralph thinks he's going to be streaming he's insane, the guy has been to prison - he knows even if he could get a device that could stream, he would need to keep it hidden from the guards, other inmates and find somewhere private from which to do the show. Achieving any one of those things would be a challenge, but all three would be nigh-on impossible to do alone. If he had other inmates involved, yeah sure he might - MIGHT - be able to pull it off.
However, even if he did manage to pull it off it would only take one Ayyylawwg to tip the relevant authorities off that he is streaming from prison and the game would be up. They could inform them of the time and name of the inmate and even supply them with video evidence of the stream. The fact Ralph is thinking about this really does show he is detached from reality.