You're probably right about urban prisons. I always think of them as remote but there are plenty in places with very high signal strengths, which would create p

You're probably right about urban prisons. I always think of them as remote but there are plenty in places with very high signal strengths, which would create problems. Low-power pico-cells inside the prison walls could presumably be configured to not cause problems outside. But yes, RF planning is a nightmare and there would doubtless be problems.