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All cell phone towers operate on three uni-directional sectors that that are roughly separated at 120*. These prisons could've just gone to the cell phone companies and ask them to swich off or reduce the footprint of the sectors of any site that points at the prison. It's not 100% effective, as a cell could possibly reach the remaining sectors pointing away from a prison (but have poor call quality), but it's much less disruptive than jamming.
Certain technologies, such as CDMA are also more resistant to jamming because they operate simultaneously on multiple frequences rather than just one frequency. The amount of power needed to jam a CDMA signal would be disruptive a more than just cell phones.
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Cameron originally envisioned the Terminator as a small, unremarkable man, giving it the ability to blend in more easily. As a result, his first choice for the part was Lance Henriksen. O. J. Simpson was on the shortlist but Cameron did not think that such a nice guy could be a ruthless killer.
-From the Collector's Edition DVD of The Terminator
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