I don't understand why prisons don't operate cellphone jammer's and then this sort of thing wouldn't be a problem. The guards communicate by radio so their ability to contact each other would be no trouble with the landlines only the prisoners with smuggled cellphones would find they can no longer communicate with the outside world. Terrorists & gangsters can plan everything from inside their jail cell so this is a big problem. As for this guy who was giving them the phones, I hope he rots in a cell for a long time without access to a telephone.
Reformists are in the lead in Iranian parliamentary elections (dpa)
from the article: Jewish inmate allegedly smuggled phones to security prisoners