sim not valid screen

[geline]

i updated my iphone4 (gevey sim unlocked) from 4.3.3 to 5.1. and wasn't aware that it will kind of deactivate my phone. it says ACTIVATION FAILED/SIM NOT VALID.
someone told me that it can be unlocked by knowing its carrier. can anyone tell me the carrier of this phone? And if possible, help me how to unlock it. thank you in advance.

IPHONE 4/32 gb
serial number: 83030GKJA4T
model: MC319LL
carrier lab 12.0
imei: 01 242400 384969 0
baseband: 04.12.01

[cts2007]

Originally Posted by geline

i updated my iphone4 (gevey sim unlocked) from 4.3.3 to 5.1. and wasn't aware that it will kind of deactivate my phone. it says ACTIVATION FAILED/SIM NOT VALID.
someone told me that it can be unlocked by knowing its carrier. can anyone tell me the carrier of this phone? And if possible, help me how to unlock it. thank you in advance.

IPHONE 4/32 gb
serial number: 83030GKJA4T
model: MC319LL
carrier lab 12.0
imei: 01 242400 384969 0
baseband: 04.12.01

IMEI: 012424003849690
model: iPhone 4 32GB Black
version: 5.1
serial: 83030GKJA4T
mac: 7C:C5:37:45:A8:73
warranty coverage: Out of Warranty
warranty period: 2010-08-04 /
purchase country: United States
activated: yes
carrier: AT&T United States
SIM locked: yes


this not posibile to unlock....................