A telecom inaccuracy in this show:
1) He uses a payphone in the prison yard and you hear the coin drop at the end of the call.2) He uses a quarter from his pocket to unscrew something.
Prison inmates are never allowed to have any money; money in prison leads to problems. He would not have a quarter to begin with and the payphone wouldn't take coins.
Secondly, the inmate's phone would be in a secured area since only authorized inmates could make calls on it.
Third, screws, nuts, and bolts in prisons are all specialized hardware to prevent exactly what he was trying to do. You need special tools with odd shapes to do anything. Furniture is often plastic one piece to prevent what he was trying to do as well as for safety (throwing it on top of someone). He would not have been able to remove the bolt from the bench, nor use the bolt to remove the toilet wall.
Cell searches are far more through that what was shown--they go through anything and everything to check for contraband drugs, hooch, and shivs and shanks. Shivs and shanks are a major problem.
The Discovery Channel and MSNBC has some good documentaries on prison life, the inmates, and the corrections officers.