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I know nothing of the technology required to jam a cell signal but I can't imagine that the cost of implementation and maintenance would be cheaper than stepping up security to crack down on smuggled phones and expanding the preexisting means of communication.
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implementation is cheap. Just plug it in and turn it on. That's why prisons want them. Hammers are "dumb" devices. They take a signal and amplify it so that it's strong enough to overpower the signal you want to block.
The problem is that cell phone technologies don't rely on a single transmit and recieve frequency. You'd have to either buy multiple jammers for each frequency or one jammer powerful enough to block out a block of frequencies. The problem with the former is the unintended harmonics that are generated will cause inteference. The latter will knock damn near everything off the air. And something that powerful you don't want to be in the vicinity of.