This is a tutorial on how to install a hacked carrier update on a jailbroken iPhone. You will need to have ifile and safari download manager, both available on cydia, installed.
Make sure you make a back up of your original carrier file!
Hacked Carrier file link:
Does this let you use any sim without the sim not supported message when you put your sim in?
hi
I have iPhone 4 locked to AT&T US
but safari download manager doesn't support iso 7.1.2
please do u have different method
Dose this give you free service on your iphone
What does this do exactly ?