I have a PWN'ed iPhone which is unlocked and was working quite happily on a 3rd party carrier. However, all of a sudden I am getting "no service" on the phone connection. I have rerun BootNeuter (locked and unlocked it to make it do something and then tried downgrading to 3.9 and back to 4.6) however to no avail. How can I determine whether this is actually a hardware fault ? Incidentally I have a 2nd unlocked phone to hand and that works quite happily with the SIM from the broken one.

Problem now fixed by putting in my official O2 SIM from another phone, and then was able to put in a 3rd party one.