You can. Here's what you can't bring.
AT&T Center info.
Cameras
All policies are event specific, so please call 210-444-5000 to verify prior to coming to the event. No professional camera/video equipment may be brought in for any AT&T Center event including “detachable” lenses, lenses that are longer than 3 inches or flashes. Any patron caught with prohibited equipment will have their film confiscated by an usher immediately and taken to Guest Services at Section 101. Items can be picked up at the end of the event. The AT&T Center is not liable for any damage, loss or theft to any items brought into the AT&T Center.
http://www.attcenter.com/default.asp?att_center=63