Hi,
I think it is ~20th my iphone and its first one which is factory unlocked, so I have no idea if I jeilbreak it, will it make it locked again ?
Its iphone 4, 5.1.1 at and t unlocked.
+1... as long as it's TRULY a factory unlocked (or unlocked from it's orginal wireless provider, same thing) iDevice. Jailbreaking will not affect it..