They simply don't have the ability to do that. We are a modern military and banning such devices would affect mission readiness. I can tell you that 90% of the time my cell phone rings, if it is not my wife, it is someone from my command --and they aren't calling to talk about the weather. Most commands have FB pages and this is where they dispense news about the command. We need email to communicate with each other and internet access for logistics purposes.
The best the military can do is to issue strict guidelines about OPSEC and punish anyone who violates them.
Sorry, but none of that is necessary. Mission security is totally absent in that environment.
If that is what the state of our military is today, we need to bring EVERY service man home without delay.
This kind of loosey goosey communications smacks of small town police environment where there isn’t a cohesive enemy bent on killing every one of our friendly forces.