... The problem did not affect AT&T's older and slowernetworks that use 2.5G EDGE or GSM technologies. This...most customers' devices were able to switch to the slowernetworks to make calls and to send and receive data...
http://news.cnet.com/8301-30686_3-10414385-266.html
...increase the total cost of ownership since more security solutions mean: More initial purchase and set-up costs Slowernetworks More management effort Increased support issues (especially when the solutions conflict). For these reasons...
http://www.findwhitepapers.com/whitepaper2075/