I bought a secondhand iPhone 4 recently. It's been updated to 6.1.3, unlocked and working perfectly. Using an app called iFunbox I've been reviewing the contents of the phone. At the top of a tree of folders it says "Thomas's iPhone - iPhone 4 on USB (Jailed)". Does this mean that it's jailbroken, even though I see no icon for Cydia or Installer? Perhaps this is because the guy before me removed all his contents? Thank you.