Re: would a
A net. Yes.
Make it with a metal (wire) running through the mesh and it would act as a shield against mobile phone signals (if the mesh was correctly designed). That wouldn't completely block the signal, but it would make things harder. Randomise the daily schedule so that pre-scheduled "drops" would have a much lower chance of anyone being able to collect the contraband.
In addition, remove the opportunities to recharge the phones once they are inside the prison.
Biting the hand that feeds IT
