The phone system at the U.S. Army Corps of Engineers’ management office/visitor center at Buford Dam is out of service. Those needing to reach someone at the office, which oversees operations at Lake Lanier, are asked to call 678-714-5274 until further notice, said Lisa Parker, spokeswoman for the corps’ Mobile District. The office’s aging phone system is “just kaput,” said Tim Rainey, the corps’ operations project manager at Lanier.