SoftBank, Japan unlocks for iPhone are very expensive, like 10k rupees and such. I would suggest you check the xsim, rsim and such solutions for unlocking (does not actually permanently unlock).
no option for softbank buddyI have used Swift unlock for unlocking my US iphone previously.. you can give them a try if you want - http://www.swiftunlocks.com/
Guys I need help to unlock my iphone 4 which is already updated to ios7
Its network locked with Softbank,Japan
One of my friend brought that for me from Japan
Modem Firmware 04.12.09
I tried manish market for network unlock, but they are asking me hefty amount for same
any link buddy ?Try R-Sim(old ver.). Its for 4s but i read somewhere it works on 4 also