Requirement:
Rooted phone

Currently supported Devices:
SAMSUNG GALAXY Y SERIES
--GT-S5360
--GT-S5360B
--GT-S5360L
--GT-S5360T
--GT-S5363
--GT-S5369

SAMSUNG GALAXY PRO
--GT-B5510
--GT-B5510B
--GT-B5510L

SAMSUNG GALAXY POP PRO
--GT-S5570I

SAMSUNG GALAXY ACE
--GT-S5830i
--GT-S5830C
--GT-S5830M
--GT-S5839i


Instructions:

1.Download Galaxy Toolbox

2. Install the apk on your phone

3.Run Galaxy Toolbox

4. Tap the checkbox at the lower end and tap "Let me in"




5. On the main menu tap "backup bml15 partition" (it is important you create a back up of your bml15 so that you can restore it later if you want to relock to your default network for warranty purposes)



6. Tap "save" to save bml15



7. after creating a back up, go back to Galaxy Toolbox main menu and tap "Network unlock"



8. Lastly, tap "Unlock my Galaxy!"



To check if your network lock is "OFF", dial *#7465625#

That's it finally you can insert simcards from other networks..

ENJOY!! 

CLICK HERE (A) 

or

SamsungGalaxyToolbox.apk 

Big Thanks and Credits to:
OuterHeaven
Team Aqua
xda developers
SB
den12345

Created by:
+_kyosuke_+

Log in