Communications and guerrilla warfare
While many people have quite rightly condemned this for its criminality, there is the other side to the coin. Communications for 'normal' people (civvies) can be a life saving tool in an ever changing war zone with blurred lines and dynamic flow.
Given the lack of encryption, its clear to see that the use of the network for military purposes is limited, wile it cannot be ruled out, the lack of security makes its use a liability that most would steer well clear of. For the civilian population however it is a vital lifeline for survival and moral.
Contacting loved ones can be just what a person who has lost everything else needs to get back on their feet. A warning of an impending attack or ongoing disaster can give options and a greater chance of survival to those who otherwise would be caught up in an engagement.
As simple and black and white as this viewpoint is (not being there non of us can really comment to much on actual effect or application) the greater picture can justify this sort of action.
On a technical level, an audacious and unparalleled attack on communications infrastructure, to be applauded and studied by others worldwide (the security of communications in a war/fall situation? some one must have had a look in to this)
From a political or legal prospective, massively illegal by one side and a moral boosting lifesaver to the other. Only the outcome of the current situation will determine what light this will be finally viewed in.
Morally and ethically, well that is for each to decide, but given the situation, i believe, as long as abuses of the system do not occur (odds of that, probably not great lets face it, some one will abuse this) then this action is justifiable.
Personally, were i to be in a similar situation to many of the people embroiled in this situation, i feel being able to contact friends and family would be more important to me than anything else.