i437 after unlock no network
 

Selected model: I437
Selected port: COM106 SAMSUNG Mobile USB Serial Port
Selected port speed: 115200
Reading phone info...
Build: M8960A-AAAANAZM-2.0.01093
Reading security... error access denied
Done with Samsung Tool v.17.0

Selected model: I437
Selected port: COM106 SAMSUNG Mobile USB Serial Port
Selected port speed: 115200
Searching ADB device... OK
Reading phone info...
Model: SAMSUNG-SGH-I437
Android version: 4.1.2
Product code: SGH2I437ZSAATT
Phone version: I437UCDMG3
PDA version: I437UCDMG3
CSC version: I437ATTDMG3
IMEI: 353128050190489
Phone S/N: R31D10ALXJT
Checking Super user right... true
Backuping MMCBLK... OK
Writing data to phone... OK
Rebooting phone... OK
Waiting phone... OK
Bypass MSL... OK
Unlocking... OK
Reseting... OK
Unlock done
Done with Samsung Tool v.17.0

check your imei and serial number

Now Repair Phone ? i have this problem !