This really comes down to cost. The costs involved in policing the situation (i.e. making sure that prisoners don't have mobile phones) versus simply making the mobile phones inoperable are incomparable. It's much cheaper to just switch off the signal.
You aren't going to get the funding for the former.
They need to develop a system where they can effectively turn off the coverage for a prison. It will have to do with the placement of cellular towers rather than jamming.
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"My hands are on fire. Hands are on fire. Ain't got no more time for all you charlatans and liars."
- Old Man Luedecke
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