Huawei U2800 AT&T unlocked done via SIGMA.....[Reference]
PROBLEM:
Lock to AT&T network need to unlock
TOOLS:
Sigma Box and Micro usb cable
PROCEDURE:
-Turn off the phone
-insert cable to the phone
-Install driver
-Select Platform to QUALCOM
-Select right Comport
-Select Model U2800
-Tick DIRECT UNLOCK done
PROBLEM:
Lock to AT&T network need to unlock
TOOLS:
Sigma Box and Micro usb cable
PROCEDURE:
-Turn off the phone
-insert cable to the phone
-Install driver
-Select Platform to QUALCOM
-Select right Comport
-Select Model U2800
-Tick DIRECT UNLOCK done