First of all, the legality of cell phone blockers (jammers) is different from country to country. For instance, they are illegal in the United States. They are covered by Communications Act of 1934, as well as property theft laws (since people pay to send and receive these signals). You can get an $11,000 fine, along with some other unlovely things.
You build a jammer by creating a signal of the same frequency with enough power to cancel out the other signal. If the two signals are the same, they will collide and cancel.
No, but many inter and intra communications systems on the roof of many hospitals can interfere with cell phone reception, this is also true in many "big box" stores, though many consumers believe the store has a cell phone blocker, whatever that is, in place to stop ' phone shopping' for better prices.
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