Was it just a matter of time before our cellphones were hit by hackers?

AT&T is facing comprimising situations with hackers and their cellphone service to its customers and to business associates abroad. To date, some $2 million dollars have been diverted from business and customer’s accounts to militant groups associated with Pakistan. AT&T has had to absorb these loses. Question: are hackers just targeting AT&T or have the other cellphone carriers suffered similar tactics and loses and have not told the public or their customers? And, is this becoming a serious situation that we should be concerned about?

Source: Yahoo News