It can connect over ppp but so can a lot of other things. This is sort of like saying that because Firefox connects over TCP/IP, the html protocol is just TCP/IP or that a Porsche is just old plain asphalt because it gets somewhere by road.
They had a HUGE store surge
Store surges! Mississippi should patent that. The Feds could fund the R&D to make it scalable. Then it could be licensed to Macy's, Target, Home Depot & Co. for a percentage of the increase in sales. The Federal R&D funds could be repaid with the profits.
Well, shiver me timbers! The Grammar Nazis' left me in charge and here be this juicy morsel. I are the Pirate of unintentionally humorous abuse of words. Argg! Set sail, mateys! We be boarding Dubya next!
Whether things are handled by jamming or by a micro-cell solution or some other way, there's one big problem. A lot of prisons are very close to major interstates or population centers. The main max in Texas is right next to I-35 a few hours south of Dallas, a road that carries so much traffic, you will rarely get up to the speedlimit. Colorado has a facility that, if memory serves is right off I-70.
Any solution that is sufficient to cut off all the prisoner cell phones is going to interfere with the use of cellphones nearby... like those people on that freeway next door.
The freeway next to I-35 in Texas has posted signs (no joke) warning people to not pick up hitch hikers. They existed long before four prisoners escaped a few years back. Two or three of those prisoners made it out of state. One made it about a thousand miles.
If they put in jammers, my suspicion is that the next prison break is going to involve prisoners walking up on to the freeway and using a rock to take out a windshield and a driver. I'm sure they'll say a few thanks for the cellphone jammers as they drive away and the other drivers realize they can't call 911...
FWIW, if you want to get between DFW and the other major metros in Texas, like Austin, you've got roughly two choices: I-35 and a 350-400 plod along two lane Farm to Market roads frequented by farm tractors. Talk about a looong day.
We can predict everything, except the future.