Interesting question...however, let me rephrase it just a bit and see if any opinions change.
As educators, think of the costs associated with provided technology in secondary education. The capital expense, the upkeep, network costs, damage, loss, etc. Computers become outdated, damaged, obsolete. Most school districts are required to run levys or bonds to acquire computers that become outdated before they are even installed and running. Most schools can only provide computers in special computer labs and maybe schools have 2 or 3 labs for use. It's even worse in each classroom where perhaps there are half a dozen units. Certainly not enough for each student. Using them becomes a management nightmare.
Now consider this: what if I showed you a way where EVERY student can have their own computer in class? What if I told you there would be no cost to the school district? No updating, no maintainance costs, no liability for damage or loss? Sound too good to be true? Well, that's exactly what a smart phone is. A computer more powerful than most desktops of only a few short years ago.
The challenge, of course, is helping students (and parents) understand the appropriate use of this technology. Like it or not, as long as there is electricity, students will have cell phones. Trying to limit their use is as fruitless as trying to eliminate gum chewing. Better to establish the proper way to use them than trying to limit them. Get on board or be left behind, I think.