In four words . . .
Yes, it's worth it.
Everyone uses the same damned excuse every time this topic comes up. OMG what if a doctor is at the movie and he gets an emergency phone call and has to jump right up and go perform BRAIN SURGERY right away . . . . and . . . and your jammer prevents him from getting the call and . . and . . someone DIES. . . .
Yeah. SHUT UP. Hospitals have f*cking SHIFTS and the GD hospital is FULL of more doctors at any given moment than all of us combined even know. Stupid fucking argument. The whole, omg the emergency folks can't do their job argument is really getting old.
Show me an establishment within a reasonable distance of the civilized world and I can guarantee you they have land line systems for emergencies. Likely several. Why ? Because cell phones are unreliable that's why. . . . .
Solution: Set aside a small part of spectrum designed for emergency personnel if you really think the above argument is a valid one. Their phones will run on this frequency only. Hand it out to all the folks that qualify as emergency personnel and done. Since jammers work on specific frequency bands, no one will bother making one for this frequency as too few folks will actually use it. Kinda like writing viruses for Linux systems. Yeah you can, but why ?
Cell phones aren't reliable to begin with. Signal strength comes and goes, calls get dropped constantly. The damn service is so bad you wouldn't know if it was your shitty service that's dropping the call or some one with an active jammer. This is a moot argument until cell phones actually provide a reliable service.
There are three means to deal with an asshole talking on a phone where they shouldn't be.
1) Hope they realize their error and STFU on their own. Unlikely as most who are guilty of this behavior are too damn stupid to realize what they're doing is annoying the shit out of everyone around them. This is a by-product of a world without consequences. They talk and act like assholes because no one will do anything to stop them out of litigation fears.
2) Run a jammer. This effectively removes the problem since . . . ( see number 3 )
3) Talk to them about it. This is pointless and will likely start a damn fight. Folks get quite pissy when you ask them to put the phone down or refrain from talking at 110db. Ask me how I know this . . . . :|
All that being said let me say this:
These devices are a godsend in certain scenarios. The portable ones typically have a 10m range and are easy to use. Push a button for a temporary 30 second disruption ( all phones will show " No Signal " ) or a flip switch for a continuous cone of glorious cell-free silence. Movie theaters, quiet restaurants, live performances, libraries, church, hospitals, you know. . . all the places where Common Sense would dictate " Hey, maybe this is a bad time to have my Lady Gaga ringtone fire up at max volume for the thirty seconds it's going to take me to dig through my purse to find my phone " all perfect examples of where jamming comes in handy.
Trust me, you'll get nowhere trying to teach them why they are in the wrong here. Unless you enjoy fighting, it's far, FAR easier just to deal with it discreetly because establishment management surely isn't going to do anything about it.
Now, I wouldn't have to resort to such measures if the management of any of the aforementioned establishments removed them from the premises for blatantly annoying the rest of the patrons. Since the world is a litigation-happy place, no one would dare say anything to anyone. Welcome to reality.
Thus, the jammers popularity.
Ever consider these little devices probably wouldn't sell so well if folks didn't believe there to be a problem worth purchasing one to begin with ?
Tip: ( from experience )
Don't use these on the bus or near roads / motorways. As driver X is blasting down the road with phone glued to her ear she is already distracted. If she loses her conversation due to your jammer, the very first thing she will do is pull the unit away from her head and stare at it. This means she is no longer looking at the road. Bad things happen when folks don't pay attention to the road . . . .
Realize your device is only good for as long as the cell phones use their current frequency assignments. Once technology shifts ( and it does it quite rapidly ) your device is an expensive paperweight. In other words, a jammer built for 3G systems won't do squat to 4G phones. So be prepared to spend $$$ over the years if you plan to keep up with technology changes.